Problem with site security certificate in Exchange 2010

Can I assume you have a different internal (e.g. exchserv.lanname.local)and external (e.g. mail.domainname.com) server name for your exchange server?   Is that internal name on the certificate?

If this is your issue (answered yes & no above): here is a workaround - you can create a LOCAL dns entry on network to point the external name to your internal exchange server IP address.  (note this will NOT match what the internet says for the giving domain name- which will specify your WAN IP.)  You can then configure outlook using the external name and it will find the server and match the cert.

Hi,

For this setup you need à SAN certificate (Subject Alternative Name) which contains your internal domain and your external domain.

Patrick, after 2015, internal names can no longer be used on SAN certificates.

So you are better off setting your Internal URLs to match your External URLs and then using split brain DNS, where you have a non-authoritative copy of your external DNS namespace on your internal DNS servers.

Yes. we have different internal (e.g. exchserv.lanname.local)and external (e.g. mail.domainname.com) server name for exchange server. Error pops-up is related with internal server name.

Yep, just make your internal URLs match your external URLs in Exchange and use split brain DNS to create those external records to map to internal IPs.

That's called "split-brain DNS"? LOL, love it!