- stunnel-users - stunnel.org

Suppressing warnings
by Ian Pilcher 31 Oct '23

31 Oct '23

I am using stunnel (along with an Apache reverse proxy) to enable my browser to connect to my old managed switches. An example configuration looks like this: debug = warning syslog = yes [switch1] client = yes accept = 127.0.0.1:8081 connect = 192.168.4.1:443 verifyChain = yes checkHost = switch1.example.com CAfile = /etc/pki/ca-trust/source/anchors/example-com-ca.crt sslVersion = TLSv1 ciphers = DHE-RSA-AES256-SHA options = ALLOW_UNSAFE_LEGACY_RENEGOTIATION securityLevel = 1 OCSPrequire = no Everything is working, but I'm seeing a lot of warnings in my system log: OCSP: No OCSP stapling response received transfer: s_poll_wait: TIMEOUTclose exceeded: closing Are there any settings that I can use to suppress these warnings? Thanks! -- ======================================================================== If your user interface is intuitive in retrospect ... it isn't intuitive ========================================================================

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TLSV1.0
by Stefano Pelli 27 Oct '23

27 Oct '23

Dear all, as my first post, I am asking a confirmation: is TLS ver 1.0 still supported by stunnel (unfortunately, I need that deprecated version to access a server)? It all worked fine, then I upgraded to Kubuntu 22.04 and for some reason that broke the support of this protocol. I get the connection closed right after trying to open it. Before upgrading all was working without a hitch. Since then (1 year ago), I have been looking for solutions and trying all sorts of fixes by changing stunnel.conf, but with no success. Can you be so kind to give me some info about this and if possible a remedy until the server gets updated (not under my control)? Thank you in advance, Stefano

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Re: TLSV1.0
by Stefano Pelli 26 Oct '23

26 Oct '23

At 04:26 AM 10/26/2023, Thomas Ward via stunnel-users wrote: >This is not an STunnel issue but an OpenSSL libraries/defaults issue. Thank you Thomas. After your input I made some more tests. Following advice founf in the net, I had already included: >[system_default_sect] >CipherString = DEFAULT@SECLEVEL=1 in openssl.cnf But still it would not work through stunnel. Today I tried a connection directly from openssl and I managed to succesfully initiate and conclude a proper POP3 dialog with the culprit server. Then, looking at the messages from openssl, I saw that the connection was established, as expected, by TLSV1 and AES256-SHA protocol. Therefore, I tried to force this in the relevant section of stunnel.conf: >ciphers = AES256-SHA But with the same result when trying to open the connection through stunnel (5.71) >telnet 127.0.1.1 110 >Trying 127.0.1.1... >Connected to 127.0.1.1. >Escape character is '^]'. >Connection closed by foreign host. With the other servers I can this way estblish a POP3 dialog, as I managed directly through openssl. What am I missing here? Thank you for any addition insights! Stefano

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Silent installation is not working for Stunnel v5.71
by meta＠adaptiva.com 23 Oct '23

23 Oct '23

Hi Team, We are 3rd party patch provider like PatchMyPC or ManageEngine. We are providing similar services to our customers and willing to add Stunnel to our catalogue. https://adaptiva.com/products/autonomous-patch We have downloaded the binary from below URL – https://www.stunnel.org/downloads.html We are trying to install the application silently, we found -quiet as silent switch for this application. But that is not installing the application silently. Could you please help us to install the application silently.

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Re: Silent installation is not working for, Stunnel v5.71
by Miroslav Geisselreiter 23 Oct '23

23 Oct '23

Hi, we use /S switch which works for us for a long time. Miroslav Geisselreiter > Message: 1 > Date: Mon, 23 Oct 2023 08:30:30 -0000 > From: meta(a)adaptiva.com > Subject: [stunnel-users] Silent installation is not working for > Stunnel v5.71 > To: stunnel-users(a)stunnel.org > Message-ID: <169804983049.1982.1603425052292506533(a)stunnel.org> > Content-Type: text/plain; charset="utf-8" > > Hi Team, > > We are 3rd party patch provider like PatchMyPC or ManageEngine. We are providing similar services to our customers and willing to add Stunnel to our catalogue. > https://adaptiva.com/products/autonomous-patch > > We have downloaded the binary from below URL – > https://www.stunnel.org/downloads.html > > We are trying to install the application silently, we found -quiet as silent switch for this application. But that is not installing the application silently. > Could you please help us to install the application silently. >

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Re: How do I hide my browsing?
by Eberhard 21 Oct '23

21 Oct '23

Exactly! If people could get around the Forti products that easily they would not have the reputation they have! Eric VICS, LLC Eric S Eberhard 2933 W Middle Verde Rd Camp Verde, AZ 86322 928-567-3727 (land line) 928-301-7537 (cell phone) http://www.vicsmba.com <http://www.vicsmba.com/> https://www.facebook.com/groups/286143052248115 From: Thomas Ward via stunnel-users <stunnel-users(a)stunnel.org> Sent: Friday, October 20, 2023 6:11 AM To: Jason Long <hack3rcon(a)yahoo.com>; Stewart Anderson via Stunnel-users <stunnel-users(a)stunnel.org> Subject: [stunnel-users] Re: How do I hide my browsing? Stunnel is not a VPN, so no it can't "hide your browsing". Hiding your browsing needs more than just stunnel because of how DNS and other components for browsing work. Question 2 is beyond the scope of stunnel's list to answer. This said: If you have to ask how to hide your browsing that means you're violating your network's use policies, and with Fortinet and Fortigate in line it sounds like you're on a workplace network. Just don't use your workplace network for whatever shady stuff you're concerned about them finding you doing. Sent from my Galaxy -------- Original message -------- From: Jason Long via stunnel-users <stunnel-users(a)stunnel.org <mailto:stunnel-users@stunnel.org> > Date: 10/20/23 09:05 (GMT-05:00) To: Stewart Anderson via Stunnel-users <stunnel-users(a)stunnel.org <mailto:stunnel-users@stunnel.org> > Subject: [stunnel-users] How do I hide my browsing? Hello, In an internal network, they monitor web browsing through firewalls (Fortinet and FortiGate). I have two questions: 1- Can I use Stunnel to hide my browsing? 2- Can they capture usernames and passwords for email and other websites? Thank you.

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How do I hide my browsing?
by Jason Long 20 Oct '23

20 Oct '23

Hello,In an internal network, they monitor web browsing through firewalls (Fortinet and FortiGate). I have two questions: 1- Can I use Stunnel to hide my browsing? 2- Can they capture usernames and passwords for email and other websites? Thank you.

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stunnel cmvp number
by Seray Tokadli 09 Oct '23

09 Oct '23

Hi, for our company i need to find the cvmp number for stunnel however I am not able to find it. Is there anyone who can help me with that? https://csrc.nist.gov/projects/cryptographic-module-validation-program/vali… I could not find stunnel here. -- Seray TOKADLI KILIÇ +420778116052

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Re: stunnel smtp tls frontend server/proxy for remote backend postfix
by James Thornton 09 Oct '23

09 Oct '23

The direction is mail sent from an external email address to stunnel (running on google cloud) for delivery to a postfix mailbox running on a local network. I posted this question on serverfault ( https://serverfault.com/questions/1145279/stunnel-smtp-tls-frontend-server-…), and someone said the problem may be either stunnel strips the ip and/or the the sender is trying to switch to TLS on postfix, not realizing the TLS connection has already been made by stunnel. On Sat, Oct 7, 2023 at 9:22 AM Stewart Anderson <stuson_2000(a)yahoo.co.uk> wrote: > Client and server will both negotiate SSL. Your server mode is presenting > a certificate. > > It's not clear from your config /text which direction your traffic is > going !! > > If it's incoming from Google to your postfix server then server mode is > correct. Stunnel will negotiate the SSL and then forward to postfix in > clear. If the handshake isn't happening, have you put Google's cert in > your CA certs somewhere? > > What confuses it for me is the Google internal IP reference. If you are > getting traffic from Google then stunnel would need to be accepting on the > host where stunnel is, so only a port is required in the accept. This can > be on a machine in your DMZ or behind a firewall, e.g. on or close to your > postfix server. > > Hope that helps. > > > > > Stewart > stuson_2000(a)yahoo.co.uk > > On 6 October 2023 05:51:14 "james(a)jamesthornton.com" < > james(a)jamesthornton.com> wrote: > > I'm running stunnel in server mode and listening on port 587 and trying to >> connect to a remote postfix server running on port 25. >> >> NB: the two servers are connected via zerortier, which may or may no be >> relevant to the issue. >> >> DEBUG = 7 >> >> [ssmtp] >> protocol = smtp >> accept = google_cloud_internal_ip:587 >> connect = remote_zerotier_postfix_ip:25 >> cert = /etc/stunnel/domain.pem >> >> I thought this would set up stunnel to handle the TLS handshake and >> terminate the TLS connection, while proxing to the backend postfix server >> without requiring postfix to worry about TLS. But I'm getting LOG3[0]: >> STARTTLS expected when stunnel tries to connect to postfix. If I put >> stunnel in client mode, then it doesn't negotiate the incoming TLS >> (right?). >> >> What am I missing? >> _______________________________________________ >> stunnel-users mailing list -- stunnel-users(a)stunnel.org >> To unsubscribe send an email to stunnel-users-leave(a)stunnel.org >> > > -- James Thornton, *http://electricspeed.com <http://electricspeed.com>*

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stunnel smtp tls frontend server/proxy for remote backend postfix
by james＠jamesthornton.com 06 Oct '23

06 Oct '23

I'm running stunnel in server mode and listening on port 587 and trying to connect to a remote postfix server running on port 25. NB: the two servers are connected via zerortier, which may or may no be relevant to the issue. DEBUG = 7 [ssmtp] protocol = smtp accept = google_cloud_internal_ip:587 connect = remote_zerotier_postfix_ip:25 cert = /etc/stunnel/domain.pem I thought this would set up stunnel to handle the TLS handshake and terminate the TLS connection, while proxing to the backend postfix server without requiring postfix to worry about TLS. But I'm getting LOG3[0]: STARTTLS expected when stunnel tries to connect to postfix. If I put stunnel in client mode, then it doesn't negotiate the incoming TLS (right?). What am I missing?

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stunnel events
by noel_melvin＠neimanmarcus.com 02 Oct '23

02 Oct '23

Whats the difference between Connection closed: : 2505 byte(s) sent to TLS, 59 byte(s) sent to socket and Connection closed: : 0 byte(s) sent to TLS, 0 byte(s) sent to socket we can see these kind of variations in the stunnel logs. if its 0 bytes doest it mean that client didnt send any data/packet to stunnel server? Need help

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Java jdk.disabled.NamedCurves
by Randy Curry 27 Sep '23

27 Sep '23

Hello, We are making a Rest API to an endpoint that uses stunnel for their proxy. We recently upgraded our integration engine and it's running Java AdoptOpenJDK 11.0.15. Since we've upgraded we can only successfully make one or two POST API calls then we get an error: Caused by: java.io.IOException: Error writing to server I did some research and found this version of Java has disabled named curves, part of it's Elliptic-curve cryptography. Is there any known issues with stunnel and the version of Java that's being used or the disabled named curves? Thank you, Randy Curry Senior Integration Services Architect [cid:image005.jpg@01D6602C.0A82CC60] [cid:image002.png@01D6602B.17ACD030]randy.curry@mihin.org<mailto:randy.curry@mihin.org> [cid:image003.png@01D6602B.17ACD030] 919.588.1036 [cid:image004.png@01D6602B.17ACD030] www.mihin.org<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.mihin.org&d=DwQGaQ&…> [cid:image006.png@01D6602C.0A82CC60]<https://urldefense.proofpoint.com/v2/url?u=https-3A__twitter.com_MiHIN&d=Dw…>[cid:image007.png@01D6602C.0A82CC60]<https://urldefense.proofpoint.com/v2/url?u=https-3A__www.youtube.com_user_M…>[cid:image008.png@01D6602C.0A82CC60]<https://urldefense.proofpoint.com/v2/url?u=https-3A__www.linkedin.com_compa…> Confidentiality Notice: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by returning the e-mail and destroying all copies of the original message.

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stunnel 5.71 released
by Michał Trojnara 19 Sep '23

19 Sep '23

Dear Users, I have released version 5.71 of stunnel. ### Version 5.71, 2023.09.19, urgency: MEDIUM * Security bugfixes - OpenSSL DLLs updated to version 3.1.3. * Bugfixes - Fixed the console output of tstunnel.exe. * Features sponsored by SAE IT-systems - OCSP stapling is requested and verified in the client mode. - Using "verifyChain" automatically enables OCSP stapling in the client mode. - OCSP stapling is always available in the server mode. - An inconclusive OCSP verification breaks TLS negotiation. This can be disabled with "OCSPrequire = no". - Added the "TIMEOUTocsp" option to control the maximum time allowed for connecting an OCSP responder. * Features - Added support for Red Hat OpenSSL 3.x patches. Home page: https://www.stunnel.org/ Download: https://www.stunnel.org/downloads.html SHA-256 hashes: f023aae837c2d32deb920831a5ee1081e11c78a5d57340f8e6f0829f031017f5 stunnel-5.71.tar.gz 945df5118473bcbf1ecdc5561fd6f26743c5dd1fd82e1a25199d0fd5c39a9373 stunnel-5.71-win64-installer.exe d511df533bb89464a324b2439e7e04b24b6ce26ecc0e03b67ada307725343d40 stunnel-5.71-android.zip Best regards, Mike

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New machine
by stunnel＠paapnet.nl 16 Sep '23

16 Sep '23

Hello All, Who can help me? Just setup a new Ubuntu 22.04 (server) machine gcc version 11.4.0 (Ubuntu 11.4.0-1ubuntu1~22.04) grabbed stunnel (git) However running into issues (an old linux box runs well with compile) configure runs well: config.status: creating doc/Makefile config.status: creating tools/Makefile config.status: creating tests/Makefile config.status: creating tests/certs/Makefile config.status: creating src/config.h config.status: executing depfiles commands config.status: executing libtool commands configure: **************************************** success Make bails out: root@dns:/Downloads/stunnel# make CDPATH="${ZSH_VERSION+.}:" && cd . && /bin/bash '/Downloads/stunnel/auto/missing' aclocal-1.16 -I m4 cd . && /bin/bash /Downloads/stunnel/auto/missing automake-1.16 --foreign CDPATH="${ZSH_VERSION+.}:" && cd . && /bin/bash '/Downloads/stunnel/auto/missing' autoconf configure.ac:53: warning: back quotes and double quotes must not be escaped in: Unknown thread model \"${withval}\" lib/m4sugar/m4sh.m4:699: AS_IF is expanded from... ./lib/autoconf/general.m4:1553: AC_ARG_WITH is expanded from... configure.ac:53: the top level configure.ac:285: warning: back quotes and double quotes must not be escaped in: bad value \"${enableval}\" lib/m4sugar/m4sh.m4:699: AS_IF is expanded from... ./lib/autoconf/general.m4:1534: AC_ARG_ENABLE is expanded from... configure.ac:285: the top level configure.ac:309: warning: back quotes and double quotes must not be escaped in: bad value \"${enableval}\" lib/m4sugar/m4sh.m4:699: AS_IF is expanded from... ./lib/autoconf/general.m4:1534: AC_ARG_ENABLE is expanded from... configure.ac:309: the top level configure.ac:334: warning: back quotes and double quotes must not be escaped in: Bad value \"${enableval}\" lib/m4sugar/m4sh.m4:699: AS_IF is expanded from... ./lib/autoconf/general.m4:1534: AC_ARG_ENABLE is expanded from... configure.ac:334: the top level configure.ac:369: warning: back quotes and double quotes must not be escaped in: Bad value \"${enableval}\" lib/m4sugar/m4sh.m4:699: AS_IF is expanded from... ./lib/autoconf/general.m4:1534: AC_ARG_ENABLE is expanded from... configure.ac:369: the top level configure.ac:4: error: possibly undefined macro: AC_MSG_NOTICE If this token and others are legitimate, please use m4_pattern_allow. See the Autoconf documentation. configure.ac:22: error: possibly undefined macro: AC_DEFINE make: *** [Makefile:409: configure] Error 1 aclocal (GNU automake) 1.16.5 autoconf (GNU Autoconf) 2.71 Is active What do I mis here ? Chrs....

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Use of dante socks proxy with Stunnel
by vinesh＠techvinesh.com 15 Sep '23

15 Sep '23

I am deploying connection between on premise database with BI application on cloud. Currently the on premise database connecting via jdbc driver and it not supporting encryption. As per my understanding Stunnel opens port listening on http:127.0.0.1 ( as local) and forward traffic to destination over https using TLSv1.2. I have few question on this , to protect on network level, 1- can I use dante socks proxy along with Stunnel to provide 2 layer of protection? On-prem --- cloud ( 2 layer of protection) -- dante socks ( unencrypted tunnel) -- Stunnel ( e2e Encryption) 2- will it supporting CA other than openSsl

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The stunnel process running on an AWS EC2 instance frequently enters a zombie state.
by sharukh.khan+stunnel＠seclore.com 12 Sep '23

12 Sep '23

We're facing an issue where the stunnel process running on our AWS Ec2 enters a zombie state. This results in the nfs server timeout (We're using EFS). We're running Amazon Linux 2 (Kernel version 4.14.318-241.531) with stunnel version 5.6.4. The configuration for stunnel is stated below: ; Sample stunnel configuration file for Win64 by Michal Trojnara 2002-2022 ; Some options used here may be inadequate for your particular configuration ; This sample file does *not* represent stunnel.conf defaults ; Please consult the manual for detailed description of available options ; ************************************************************************** ; * Global options * ; ************************************************************************** ; Debugging stuff (may be useful for troubleshooting) ;debug = info ;output = stunnel.log ; Enable FIPS 140-2 mode if needed for compliance ;fips = yes ; Microsoft CryptoAPI engine allows for authentication with private keys ; stored in the Windows certificate store ; Each section using this feature also needs the "engineId = capi" option ;engine = capi ; You also need to disable TLS 1.2 or later, because the CryptoAPI engine ; currently does not support PSS ;sslVersionMax = TLSv1.1 ; TLSv1.1 requires security level 0 when compiled OpenSSL 3.0 and later ;securityLevel = 0 ; The pkcs11 engine allows for authentication with cryptographic ; keys isolated in a hardware or software token ; MODULE_PATH specifies the path to the pkcs11 module shared library, ; such as softhsm2-x64.dll or opensc-pkcs11.dll ; IMPORTANT: A 64-bit stunnel requires 64-bit PKCS#11 modules ; Each section using this feature also needs the "engineId = pkcs11" option ;engine = pkcs11 ;engineCtrl = MODULE_PATH:softhsm2-x64.dll ;engineCtrl = PIN:1234 ; ************************************************************************** ; * Service defaults may also be specified in individual service sections * ; ************************************************************************** ; Enable support for the insecure SSLv3 protocol ;options = -NO_SSLv3 ; These options provide additional security at some performance degradation ;options = SINGLE_ECDH_USE ;options = SINGLE_DH_USE ; ************************************************************************** ; * Include all configuration file fragments from the specified folder * ; ************************************************************************** ;include = conf.d ; ************************************************************************** ; * Service definitions (at least one service has to be defined) * ; ************************************************************************** ; ***************************************** Example TLS client mode services [gmail-pop3] client = yes accept = 127.0.0.1:110 connect = pop.gmail.com:995 verifyChain = yes CAfile = ca-certs.pem checkHost = pop.gmail.com OCSPaia = yes [gmail-imap] client = yes accept = 127.0.0.1:143 connect = imap.gmail.com:993 verifyChain = yes CAfile = ca-certs.pem checkHost = imap.gmail.com OCSPaia = yes [gmail-smtp] client = yes accept = 127.0.0.1:25 connect = smtp.gmail.com:465 verifyChain = yes CAfile = ca-certs.pem checkHost = smtp.gmail.com OCSPaia = yes ; Encrypted HTTP proxy authenticated with a client certificate ; located in the Windows certificate store ;[example-proxy] ;client = yes ;accept = 127.0.0.1:8080 ;connect = example.com:8443 ;engineId = capi ; Encrypted HTTP proxy authenticated with a client certificate ; located in a cryptographic token ;[example-pkcs11] ;client = yes ;accept = 127.0.0.1:8080 ;connect = example.com:8443 ;engineId = pkcs11 ;cert = pkcs11:token=MyToken;object=MyCert ;key = pkcs11:token=MyToken;object=MyKey ; ***************************************** Example TLS server mode services ;[pop3s] ;accept = 995 ;connect = 110 ;cert = stunnel.pem ;[imaps] ;accept = 993 ;connect = 143 ;cert = stunnel.pem ; Either only expose this service to trusted networks, or require ; authentication when relaying emails originated from loopback. ; Otherwise the following configuration creates an open relay. ;[ssmtp] ;accept = 465 ;connect = 25 ;cert = stunnel.pem ; TLS front-end to a web server ;[https] ;accept = 443 ;connect = 80 ;cert = stunnel.pem ; "TIMEOUTclose = 0" is a workaround for a design flaw in Microsoft SChannel ; Microsoft implementations do not use TLS close-notify alert and thus they ; are vulnerable to truncation attacks ;TIMEOUTclose = 0 ; Remote cmd.exe protected with PSK-authenticated TLS ; Create "secrets.txt" containing IDENTITY:KEY pairs ;[cmd] ;accept = 1337 ;exec = c:\windows\system32\cmd.exe ;execArgs = cmd.exe ;PSKsecrets = secrets.txt ; vim:ft=dosini

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stunnel events
by noel_melvin＠neimanmarcus.com 11 Sep '23

11 Sep '23

We have stunnel running on Windows machine. Just would like to know whether the below events is anything abnormal/critical to be addressed. 2023.09.07 10:10:16 LOG5[7]: Service [Application1] accepted connection from x.x.x.x:1234 2023.09.07 10:10:16 LOG6[7]: Peer certificate not required 2023.09.07 10:10:16 LOG6[7]: No peer certificate received 2023.09.07 10:10:16 LOG6[7]: Session id: (Alphanumeric) 2023.09.07 10:10:16 LOG6[7]: TLS accepted: new session negotiated 2023.09.07 10:10:16 LOG6[7]: TLSv1.2 ciphersuite: ECDHE-RSA-AES128-SHA256 (128-bit encryption) 2023.09.07 10:10:16 LOG6[7]: s_connect: connecting x.x.x.x:1234 2023.09.07 10:10:16 LOG5[7]: s_connect: connected x.x.x.x:1234 2023.09.07 10:10:16 LOG6[7]: persistence: x.x.x.x:1234 cached

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Stunnel hangs with static build with openssl 1.1.1c
by eklein＠triple-eye.nl 07 Sep '23

07 Sep '23

I successfully cross compiled and built a static version of stunnel for ARM. It works with stunnel 5.70 and openssl 1.1.1b If however, I try to use openssl 1.1.1c, stunnel hangs. I narrowed the problem down to the following call in compression_init in ssl.c: comp_methods[COMP_NONE]=sk_SSL_COMP_new_null(); The program does not get past this point. I also tried to build with openssl 1.1.1v and 3.0.0, to no avail. I am using the following commands: To build openssl: ./Configure linux-armv4 --prefix=/home/erik/Documents/openssl-1.1.1b/install --openssldir=/home/erik/Documents/openssl-1.1.1b/install threads shared make CC=arm-linux-gnueabi-gcc make install To build stunnel: sed -i 's/^stunnel_LDFLAGS = /&-all-static /' src/Makefile.in export CFLAGS='-Os -fomit-frame-pointer -pipe' ./configure --with-ssl=/home/erik/Documents/openssl-1.1.1b/install --disable-fips --disable-shared --enable-static --disable-silent-rules --build x86_64-pc-linux-gnu --host arm-linux-gnueabi make What is the difference between openssl1.1.1b and 1.1.1c which causes this problem?

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Failover configuration using a proxy
by Daphne Shaw 06 Sep '23

06 Sep '23

Hello! I have a configuration question around failover with stunnel as a https client (that is, "client=yes"). The end goal here is a "Try to connect to host A, if that fails, connect to host B, etc." type of setup. I can do that with multiple connect= options, one per host, and it works as expected: connect=x.x.x.x connect=y.y.y.y connect=z.z.z.z The question I have is around doing the same thing with a proxy. In a proxy configuration, connect= specifies the proxy (https in my case, so "protocol=connect"), and protocolHost= specifies the host that I want to connect to via that proxy. Unfortunately, it seems that protocolHost only allows a single host and cannot be used multiple times, so I can't specify the hosts to failover to. connect=my.proxy.ip protocol=connect protocolhost=x.x.x.x protocolhost=y.y.y.y protocolhost=z.z.z.z That always attempts to connect to z.z.z.z (the last specified host) via the proxy. I am using stunnel 4.56 (stock stunnel from Centos 7), but happy to upgrade if a newer version makes this possible (the manual suggests the latest version works the same way). Any suggestions? I'm sure I could accomplish this by wrapping stunnel in a script that generates a new config file for each failover, but well, I'm hoping to not have to do that. Thanks, Daphne

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Connection abend between Stunnel and multiple clients
by arunprasanna_dhayalavel＠neimanmarcus.com 06 Sep '23

06 Sep '23

Hello All!! We are experiencing multiple transactions initiated from the different clients towards the Stunnel getting reset. We are trying to identify if the below events relate to the issue. If yes, kindly suggest how we can rectify the below. 2023.09.05 09:10:43 LOG6[210]: transfer: s_poll_wait: TIMEOUTidle exceeded: sending reset 2023.09.05 09:10:43 LOG5[210]: Connection reset: 2505 byte(s) sent to TLS, 59 byte(s) sent to socket

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error:0A000126 on windows 10
by Stewart Anderson 02 Sep '23

02 Sep '23

Hi, First apologies I posted this question on a google stunnel group, but I realise that does not have much activity, so posting here also. I am trying to get stunnel up and running and getting the error in the subject. The full error text is: "SSL_accept: ssl/record/ssl3_record.c:354: error:0A00010B:SSL routines::wrong version number" I have a simple service which seems to load fine. I have stunnel up at the "server side" on a VM in azure and if I telnet to the VM public address I can see the activity in the stunnel logs on the VM, so I know at least a pipe is open. I can hit the port server side and see the log activity in stunnel also. If I try a telnet to the local stunnel accept port. I see the error above. This is the full log. 2023.08.23 11:01:04 LOG7[service]: Found 1 ready file descriptor(s) 2023.08.23 11:01:04 LOG7[service]: FD=604 ifds=r-x ofds=--- 2023.08.23 11:01:04 LOG7[service]: FD=664 ifds=r-x ofds=r-- 2023.08.23 11:01:04 LOG7[service]: Service [dev-dev-testHarness] accepted (FD=708) from 127.0.0.1:10756 2023.08.23 11:01:04 LOG7[service]: Creating a new thread 2023.08.23 11:01:04 LOG7[service]: New thread created 2023.08.23 11:01:04 LOG7[4]: Service [dev-dev-testHarness] started 2023.08.23 11:01:04 LOG7[4]: Setting local socket options (FD=708) 2023.08.23 11:01:04 LOG7[4]: Option TCP_NODELAY set on local socket 2023.08.23 11:01:04 LOG5[4]: Service [dev-dev-testHarness] accepted connection from 127.0.0.1:10756 2023.08.23 11:01:04 LOG6[4]: Peer certificate not required 2023.08.23 11:01:04 LOG7[4]: TLS state (accept): before SSL initialization 2023.08.23 11:01:04 LOG7[4]: TLS alert (write): fatal: decode error 2023.08.23 11:01:04 LOG3[4]: SSL_accept: ssl/record/rec_layer_s3.c:303: error:0A000126:SSL routines::unexpected eof while reading 2023.08.23 11:01:04 LOG5[4]: Connection reset/closed: 0 byte(s) sent to TLS, 0 byte(s) sent to socket 2023.08.23 11:01:04 LOG7[4]: Local descriptor (FD=708) closed 2023.08.23 11:01:04 LOG7[4]: Service [dev-dev-testHarness] finished (0 left) What am I missing, I haven't used stunnel for quite a while and previous effort were on linux and I did not see this problem then. Using telnet/TNC as the local test tools and stunnel was installed with bare default installation. The only thing I have done different is to set a config fragment folder to separate services on the sever side and they report as loading fine. any help greatly appreciated. Stu

1 1

Re: Need help setting up new stunnel config
by Mark Foley 01 Sep '23

01 Sep '23

I think I'm confused here. My objective is for requests sent to port 3389 on the Windows 10 machine to be "validated" by stunnel, then passed on to the service listening on that port. Am I mistaken about what stunnel is supposed to do? If not, what would my config look like to accomplish this? I don't see how changing the RDC port would help. Regardless of what port RDC listens on, it's still going to be used by RDC and therefore I don't see why the 'accept' wouldn't continue to fail. Sorry to be so obtuse on this. I just don't get it and haven't found any examples for stunneling to RDC. --Mark -----Original Message----- From: Michael Curran <mike_curran(a)hotmail.com> To: Mark Foley <mfoley(a)novatec-inc.com>, "stunnel-users(a)stunnel.org" <stunnel-users(a)stunnel.org> Subject: Re: [stunnel-users] Re: Need help setting up new stunnel config Date: Fri, 1 Sep 2023 17:39:25 +0000 Mark -- Your full stanza should look like this [dbserver] accept = <some port> connect = 3389 CAfile = stunnel.pem The IP:PORT was a suggestion for the RDC connection string. If you cannot start RDC with an IP:PORT, then you can change the internal RDC port from 3389 to something else. I have not done this, you will have to review Microsofts site to find out how. If RDC can be changed , but not the RDC connection string then your stanza might look like [dbserver] accept = 3389 connect = <new rdc port> CAfile = stunnel.pem Mike ________________________________ From: Mark Foley <mfoley(a)novatec-inc.com> Sent: Friday, September 1, 2023 1:28 PM To: stunnel-users(a)stunnel.org <stunnel-users(a)stunnel.org> Subject: [stunnel-users] Re: Need help setting up new stunnel config Michael - thanks for your response. I did not see the "ip:port" syntax you suggested in the stunnel doc, so I just use 'port'. Below is the config I tried: [DBSERVER] connect = 3389 CAfile = stunnel.pem When running I got the following errors: [ ] Initializing inetd mode configuration [ ] Running on Windows 6.2 [ ] No limit detected for the number of clients [.] stunnel 5.70 on x64-pc-mingw32-gnu platform [.] Compiled/running with OpenSSL 3.0.9 30 May 2023 [.] Threading:WIN32 Sockets:SELECT,IPv6 TLS:ENGINE,FIPS,OCSP,PSK,SNI [ ] errno: (*_errno()) [ ] Initializing inetd mode configuration [ ] Running on Windows 6.2 [.] Reading configuration from file C:\Program Files (x86)\stunnel\config\stunnel.conf [.] UTF-8 byte order mark detected [.] FIPS mode disabled [ ] Compression disabled [ ] No PRNG seeding was required [ ] Initializing service [DBSERVER] [!] Service [DBSERVER]: TLS server needs a certificate [!] Configuration failed [ ] Deallocating temporary section defaults [ ] Deallocating section [DBSERVER] Notice "TLS server needs a certificate". The installation dialog steps me through creating a certificate which it puts in stunnel.pem. So why this message? I also tried the full pathname to stunnel.pem. --Mark -----Original Message----- From: Michael Curran <michael.curran(a)cosocloud.com> To: Mark Foley <mfoley(a)novatec-inc.com>, "stunnel-users(a)stunnel.org" <stunnel-users(a)stunnel.org> Subject: Re: [stunnel-users] Need help setting up new stunnel config Date: Fri, 1 Sep 2023 13:12:30 +0000 accept is the port you want them to connect on remotely – which would have to be other than 3389 since it is open already connect would be 3389 I think in the connection string for RDC you can just specify ip:port to connect If you cannot , you can also redesignate the port remote desktop answers on -- Michael Curran Systems Architect| CoSo Cloud D 614.568.2285 | C 614.403.6320 | michael.curran(a)cosocloud.com From: Mark Foley <mfoley(a)novatec-inc.com> Date: Thursday, August 31, 2023 at 11:33 AM To: stunnel-users(a)stunnel.org <stunnel-users(a)stunnel.org> Subject: [stunnel-users] Need help setting up new stunnel config I used stunnel about 5 years ago and now I want to use it again, but my notes are terrible and I'm having trouble getting started. I want to create a connection between Windows computer on port 3389. The "client" will be some remote Windows computer, perhaps at someone's home office. The "server" will be a Windows workstation at the office. I've installed stunnel 5.70 on a Windows 10 workstation at the office, hostname COMMONW10. I'm at a loss creating the config file on this machine. I have: [COMMONW10] ;client = yes accept = 3389 ;connect = ???:xxxx CAfile = stunnel.pem The stunnel.pem was create when I installed stunnel. I have no idea what the 'connect' line should have. When I run stunnel (clicking on desktop icon) I get: [.] Configuration successful [ ] Deallocating deployed section defaults [ ] Binding service [COMMONW10] [ ] Listening file descriptor created (FD=724) [ ] Setting accept socket options (FD=724) [ ] Option SO_EXCLUSIVEADDRUSE set on accept socket [.] Binding service [COMMONW10] to 127.0.0.1:3389: Permission denied (WSAEACCES) (10013) [!] Binding service [COMMONW10] failed [ ] Unbinding service [COMMONW10] [ ] Service [COMMONW10] closed [ ] Deallocating deployed section defaults [ ] Deallocating section [COMMONW10] [ ] Initializing inetd mode configuration [ ] Running on Windows 6.2 Server is down I'm assuming the "Permission denied" is because Remote Desktop is already listening on 3389. So, I'm stuck and feeling quite ignorant! Help appreciated. --Mark _______________________________________________ stunnel-users mailing list -- stunnel-users(a)stunnel.org To unsubscribe send an email to stunnel-users-leave(a)stunnel.org This is an external email and may have suspicious content. Please take care when clicking links or opening attachments. When in doubt, contact your IT Department. _______________________________________________ stunnel-users mailing list -- stunnel-users(a)stunnel.org To unsubscribe send an email to stunnel-users-leave(a)stunnel.org

2 1

Re: Need help setting up new stunnel config
by Mark Foley 01 Sep '23

01 Sep '23

Michael - thanks for your response. I did not see the "ip:port" syntax you suggested in the stunnel doc, so I just use 'port'. Below is the config I tried: [DBSERVER] connect = 3389 CAfile = stunnel.pem When running I got the following errors: [ ] Initializing inetd mode configuration [ ] Running on Windows 6.2 [ ] No limit detected for the number of clients [.] stunnel 5.70 on x64-pc-mingw32-gnu platform [.] Compiled/running with OpenSSL 3.0.9 30 May 2023 [.] Threading:WIN32 Sockets:SELECT,IPv6 TLS:ENGINE,FIPS,OCSP,PSK,SNI [ ] errno: (*_errno()) [ ] Initializing inetd mode configuration [ ] Running on Windows 6.2 [.] Reading configuration from file C:\Program Files (x86)\stunnel\config\stunnel.conf [.] UTF-8 byte order mark detected [.] FIPS mode disabled [ ] Compression disabled [ ] No PRNG seeding was required [ ] Initializing service [DBSERVER] [!] Service [DBSERVER]: TLS server needs a certificate [!] Configuration failed [ ] Deallocating temporary section defaults [ ] Deallocating section [DBSERVER] Notice "TLS server needs a certificate". The installation dialog steps me through creating a certificate which it puts in stunnel.pem. So why this message? I also tried the full pathname to stunnel.pem. --Mark -----Original Message----- From: Michael Curran <michael.curran(a)cosocloud.com> To: Mark Foley <mfoley(a)novatec-inc.com>, "stunnel-users(a)stunnel.org" <stunnel-users(a)stunnel.org> Subject: Re: [stunnel-users] Need help setting up new stunnel config Date: Fri, 1 Sep 2023 13:12:30 +0000 accept is the port you want them to connect on remotely – which would have to be other than 3389 since it is open already connect would be 3389 I think in the connection string for RDC you can just specify ip:port to connect If you cannot , you can also redesignate the port remote desktop answers on -- Michael Curran Systems Architect| CoSo Cloud D 614.568.2285 | C 614.403.6320 | michael.curran(a)cosocloud.com From: Mark Foley <mfoley(a)novatec-inc.com> Date: Thursday, August 31, 2023 at 11:33 AM To: stunnel-users(a)stunnel.org <stunnel-users(a)stunnel.org> Subject: [stunnel-users] Need help setting up new stunnel config I used stunnel about 5 years ago and now I want to use it again, but my notes are terrible and I'm having trouble getting started. I want to create a connection between Windows computer on port 3389. The "client" will be some remote Windows computer, perhaps at someone's home office. The "server" will be a Windows workstation at the office. I've installed stunnel 5.70 on a Windows 10 workstation at the office, hostname COMMONW10. I'm at a loss creating the config file on this machine. I have: [COMMONW10] ;client = yes accept = 3389 ;connect = ???:xxxx CAfile = stunnel.pem The stunnel.pem was create when I installed stunnel. I have no idea what the 'connect' line should have. When I run stunnel (clicking on desktop icon) I get: [.] Configuration successful [ ] Deallocating deployed section defaults [ ] Binding service [COMMONW10] [ ] Listening file descriptor created (FD=724) [ ] Setting accept socket options (FD=724) [ ] Option SO_EXCLUSIVEADDRUSE set on accept socket [.] Binding service [COMMONW10] to 127.0.0.1:3389: Permission denied (WSAEACCES) (10013) [!] Binding service [COMMONW10] failed [ ] Unbinding service [COMMONW10] [ ] Service [COMMONW10] closed [ ] Deallocating deployed section defaults [ ] Deallocating section [COMMONW10] [ ] Initializing inetd mode configuration [ ] Running on Windows 6.2 Server is down I'm assuming the "Permission denied" is because Remote Desktop is already listening on 3389. So, I'm stuck and feeling quite ignorant! Help appreciated. --Mark _______________________________________________ stunnel-users mailing list -- stunnel-users(a)stunnel.org To unsubscribe send an email to stunnel-users-leave(a)stunnel.org This is an external email and may have suspicious content. Please take care when clicking links or opening attachments. When in doubt, contact your IT Department.

1 0

Problem TLS connection Outlook 365
by adebelew＠gmail.com 01 Sep '23

01 Sep '23

Hi, I'm trying to connect to Outlook 365 with this setup [office365] client = yes accept = 127.0.0.1:993 connect = outlook.office365.com:993 unfortunately, when from my penthao software, I try to connect with email and password stunnel responds like this: 2023.09.01 09:57:33 LOG5[2]: Service [office365] accepted connection from 127.0.0.1:63027 2023.09.01 09:57:33 LOG5[2]: s_connect: connected 52.98.206.242:993 2023.09.01 09:57:33 LOG5[2]: Service [office365] connected remote server from 192.168.1.228:63028 2023.09.01 09:57:33 LOG5[2]: Connection closed: 258 byte(s) sent to TLS, 160 byte(s) sent to socket could you help me? is it necessary to configure the certificates? How should it be done? Thank you!

1 0

Need help setting up new stunnel config
by Mark Foley 31 Aug '23

31 Aug '23

I used stunnel about 5 years ago and now I want to use it again, but my notes are terrible and I'm having trouble getting started. I want to create a connection between Windows computer on port 3389. The "client" will be some remote Windows computer, perhaps at someone's home office. The "server" will be a Windows workstation at the office. I've installed stunnel 5.70 on a Windows 10 workstation at the office, hostname COMMONW10. I'm at a loss creating the config file on this machine. I have: [COMMONW10] ;client = yes accept = 3389 ;connect = ???:xxxx CAfile = stunnel.pem The stunnel.pem was create when I installed stunnel. I have no idea what the 'connect' line should have. When I run stunnel (clicking on desktop icon) I get: [.] Configuration successful [ ] Deallocating deployed section defaults [ ] Binding service [COMMONW10] [ ] Listening file descriptor created (FD=724) [ ] Setting accept socket options (FD=724) [ ] Option SO_EXCLUSIVEADDRUSE set on accept socket [.] Binding service [COMMONW10] to 127.0.0.1:3389: Permission denied (WSAEACCES) (10013) [!] Binding service [COMMONW10] failed [ ] Unbinding service [COMMONW10] [ ] Service [COMMONW10] closed [ ] Deallocating deployed section defaults [ ] Deallocating section [COMMONW10] [ ] Initializing inetd mode configuration [ ] Running on Windows 6.2 Server is down I'm assuming the "Permission denied" is because Remote Desktop is already listening on 3389. So, I'm stuck and feeling quite ignorant! Help appreciated. --Mark

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