Nagios Support Forum

I'm still waiting for my last reply to this thread to be approved, but I did some more troubleshooting and found that if I rolled back to the previous version of check_smtp things worked normally again: # rpm -e --nodeps nagios-plugins-smtp-2-2-1-15.20180725git3429dad.el7.x86_64 # rpm -i --nodeps na...

What version of the check_smtp plugin are you running? check_smtp v2.2.1.git (nagios-plugins 2.2.1) What I think happened is that the postfix main.cf file was changed and that it is not accepting TLS connections anymore or that the certs were regenerated on the postfix server and that is causing th...

I have Nagios Core running on a CentOS server, monitoring (among other things) TLS certs for Postfix, which is also running on a CentOS server. Both the Nagios and Postfix servers were upgraded from CentOS 7.5 to CentOS 7.6. After the upgrade, check_smtp began reporting "WARNING - TLS not suppo...