Microsoftjess_krynitsky, I looked up the description of 36871 at https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-R2-and-2012/dn786445(v=ws.11) and it looks like it is specific to SMTP. Is there another event ID that we should look for from a diagnostic standpoint?
Event ID 36871: A Fatal Error Occurred While Creating An SSL (client or server) Credential
This behavior is caused by the SMTP service processing an incoming EHLO command if no certificate is assigned to an SMTP site. This message is logged twice, once when the SMTP service starts, and once when the first EHLO command is received.
Simple Mail Transfer Protocol (SMTP) controls how email is transported and then delivered across the Internet to the destination server. The SMTP EHLO command enables the server to identify its support for Extended Simple Mail Transfer Protocol (ESMTP) commands.
