OCS R2 Communicator Web Access

Web Access URL different than host name of your web access server...Server 2008 x64 OCS R2 CWA. I had a gotchya, had to edit the SPN of the service account being used for CWA to include the url for CWA.

In ADSI Edit, default naming context (2k8 domain), locate service account, properties, locate servicePrincipalName > add value http/%url% of cwa site if different than host name.

For example:
SPN was http/$hostname$
added
http/cwa.domain.com