no alt. certificate subject name matches target host name 'cdn.richeyweb.com'

Since today we cannot access website or backend.

The error message is:
0 - SSL: no alternative certificate subject name matches target host name 'cdn.richeyweb.com'

The advice in the other post was to disabable (plg_system_eprivacygeoip and plg_system_geoip) in phpmyadmin.
Having done this - it does not work either.

Any ideas?

This can happen if your server is running an outdated version of openssl (like OpenSSL/0.9.8b).

I checked the cert on my CDN, and its alternative subject is "cdn.richeyweb.com", same as the common name.

Try updating your server to at least OpenSSL/1.0

it works again...Additonally, i deleted the cache files via ftp

I have OpenSSL/1.0.2k and got a similar message (Could not resolve host: cdn.richeyweb.com or Error 504 - Gateway Timeout
The gateway did not receive a timely response from the upstream server or application.) on 3 different Joomla sites. Disabling both geoip plugins in phpmyadmin temporary fixed mentioned issue.
Enabling it again, an issue remains.

Strange for me is a fact, that I have about 10 Joomla sites hosted on same server (everything updated), but I got error on only 3 sites.

Any ideas what can cause this issue?

Kind regards!

failure to resolve a hostname? The only issue can be a problem with the querying DNS server. Maybe overloaded?

I host my DNS on stackpath - they're super fast.

Hi
Today I have this issue also. There is newest OPENSSL version on the server (I checked it with provider). I tried to turn off plugins in phpAdmin as advised in the other post (plg_system_eprivacygeoip and plg_system_geoip) in phpmyadmin). Can't found plg_system_eprivacygeoip in extensions table. Any advise, please?

regards Tomek