Certificate mismatch Outlook Anywhere

Hi,

When connecting an Outlook 2013 client to Exchange 2013 I am getting a certificate mismatch error.

1. SSL Certificate is for the external name (exch.domain.com) has no SAN's and Outlook is looking for servername.local.  
2. I have configured all virtual directories for Exchange to use the above url (exch.domain.com) for internal and external access.
3. Have a local DNS record resolving the external name (exch.domain.com) to the internal IP of the exchange server.
4. Operating a single public IP using ARR and Windows Server 2012 Essentials
5. Have set up a SRV record in DNS for autodiscovery.
6. Outlook Anywhere in the ECP is configured to NTLM authentication
7. In Outlook, the advanced connection properties I was getting authentication prompts until I added https://exchange.domain.com as a proxy server.

Any help would be appreciated thanks.