SSL Help needed

[Gatt]

Setup

 

TMG 2010

Exchange 2010 server

 

1 x Wildcard SSL for domain

 

Installed the SSL on Exchange 2010, IIS7 (on EX server) and on TMG 2010

 

All appears good, BUT - Its not working

 

browsing to OWA I get "Error Code 500: Internal Server Error. The target principal name is incorrect"

 

Testing the OWA rule in TMG throws a similar error

 

I've read that I need to create a 2nd SSL from my Domain CA but not sure how to really do this or what SSL Cert goes where?

 

Any advise would be gratefully appreciated..