I have a site running Exchange 2013, and while setting it up initially for ActiveSync or remote HTTPS access, I was able to somehow obtain an alphanumeric server name eg: 7d59d4a4-6b8f-4def-a960-8b4a3256e7a4@domain.com.

this needs Connect via HTTP enabled with the standard OWA URL entered, and the self-signed certificate installed on the user's laptop.

this name has helped a lot because it works beautifully in all cases, whether internally or externally. 

Unfortunately I dont know how to duplicate the steps I took to get this name. I have another independent site with Exchange 2007 and would really like to know if there is a way to get a similar server name for this server.