Gmail, suddenly: TLS Negotiation failed, the certificate doesn't match the host

#1

Post by tigger_please » Wed, Apr 08, 2020, 7:31 PM UTC

Gmail, suddenly: TLS Negotiation failed, the certificate doesn't match the host
support.google.com

Re: Gmail, suddenly: TLS Negotiation failed, the certificate doesn't match the host

#2

Post by chkal » Thu, Apr 09, 2020, 3:46 PM UTC

Looks like Google is now validating the TLS certificate received from the mailserver. So the hostname of the SMTP server provided in the GMail settings has to match the certificate provided by the server. I just updated the hostname in GMail and the problem is fixed now!

Re: Gmail, suddenly: TLS Negotiation failed, the certificate doesn't match the host

#3

Post by marciokoko » Thu, Apr 09, 2020, 4:24 PM UTC

So for godaddy, where the securesever.net domain is on the tls certificate, how do i configure my outgoing which used to be mydomain.com but now fails?

Re: Gmail, suddenly: TLS Negotiation failed, the certificate doesn't match the host

#4

Post by tigger_please » Thu, Apr 09, 2020, 4:48 PM UTC

My cert, and many others mentioned on that thread, have the proper CN. It is self-signed. Gmail seems to be randomly and intermittently rejecting it.

Re: Gmail, suddenly: TLS Negotiation failed, the certificate doesn't match the host

#5

Post by yetkind » Thu, Apr 09, 2020, 5:50 PM UTC

chkal wrote: post #2

Looks like Google is now validating the TLS certificate received from the mailserver. So the hostname of the SMTP server provided in the GMail settings has to match the certificate provided by the server. I just updated the hostname in GMail and the problem is fixed now!

Yeah I also have similar problem, how did you solved it (