I have to configure a few remote Macs to connect an Exchange 2010 CAS behind a TMG2010 using native MacMail 4.3.
Windows Clients work fine. But I can't get the Macs running...
Macs are configured as Exchange 2007 clients with the external CAS URL as the mail server address.
When trying to connect Exchange from a Mac the TMG log shows this deny message:
Status: 12309 The server requires authorization to fulfill the request. Access to the Web server is denied. Contact the server administrator.
Request: POST http://<externalCASURL>/EWS/Exchange.asmx
There are more log entries following the above message stating that the path /EWS is forbidden. Thats OK without authentication.
The TMGs web listener is configured for SSL only with FBA.