Dump your stunnel.crt file.   <stunnel_home>/bin/openssl x509 -in stunnel.crt  -noout -text And, compare with  * section 4 of https://tools.ietf.org/html/rfc5280 * Peer-reviewed public sites.  https://www.ssllabs.com/ssltest/ Dump your stunnel.cnf file.  And, compare with  stunnel_home>/config/openssl.cnf file https://access.redhat.com/solutions/28965 https://www.openssl.org/docs/manmaster/man5/x509v3_config.html ---------------------------------------------------------------------- From: Pierre DUPONT <pierre.dupont@nedap.fr> De : Pierre DUPONT Envoy? : jeudi 5 septembre 2019 16:55 Cc : _sav.bibli <sav.bibli@nedap.fr>; Philippe ANQUETIN <philippe.anquetin@nedap.fr> Objet : using sTunnel with Chrome Good day to all. So far, I can't succeed to use Chrome with sTunnel. Here is my configuration for sTunnel.... However, I cannot connect on https I tried several things found browsing the list, like building a certificate with openssl req -new -x509 -days 365 -nodes -config stunnel.cnf -out stunnel.crt -keyout stunnel.crt No result so the only solution I see now is to call you for some help... With kind regards, Cordiales salutations de Pierre Dupont Support S.A.V. & D?veloppement Biblioth?ques Courriel S.A.V. : sav.bibli@nedap.fr<mailto:sav.bibli@nedap.fr> 06 13 99 69 38 - 01.61.03.03 18 8/10 Chemin d'Andr?sy 95610 Eragny sur Oise NEDAP LOGO