I have the following problem running stunnel on Centos 6.x 64bit with the following error: I have been search with google to see if there was a solution but nothing was found Thank you for your reply and your help, hopefully I can get this solved. ******************************************************************************** Clients allowed=500 stunnel 4.52 on x86_64-unknown-linux-gnu platform Compiled/running with OpenSSL 1.0.0-fips 29 Mar 2010 Threading:PTHREAD SSL:ENGINE,FIPS Auth:none Sockets:POLL,IPv6 Reading configuration from file /usr/local/etc/stunnel/stunnel.conf FIPS_mode_set: 2D06C06E: error:2D06C06E:FIPS routines:FIPS_mode_set:fingerprint does not match *******************************************************************************