I have asked this question previously but I can't seem to get it to work still.
Basically we have an Exchange 2010 server with two accepted email domains (company.ie and company.co.uk). The .ie is the main domain that was setup when the Exchange Server was first setup (as part of SBS 2011). Email for both domains works perfectly internally and externally. The issue arises for the users on the company.co.uk email domain. When these users open Outlook 2010 they receive a Security Alert about the Security Certificate is invalid or does not match the name of the site. We use OA for all external users and have a single name SSL certificate with the name remote.company.ie. The Exchange Proxy settings point to remote.company.ie for all users. The .ie users have no problem only the .co.uk users.
Just wondering do I need to have a new SSL certificate (SAN cert) created that includes the autodiscover.company.co.uk and the remote.company.ie or is there something I can do with DNS records that would resolve the issue. While it does not effect functionality it is annoying the users.
UPDATE: Just checked the external DNS records for the .co.uk domain and see there is a autodiscover.company.co.uk A Record created and points to the IP Address of the .co.uk Website (we have two web sites .ie and .co.uk). Could I change the A Record and point it to the Exchange Server IP Address or should I use a different Record Type (CNAME or SRV).
Any input would be appreciated.