Background. 4 sites in AD. The one site is central in a datacentre. The three branches have Exchange 2007/Windows 2003. The Datacentre has Exchange 2010/Windows 2008.
I am trying to configure the Datacentre OWA to be the central point with a central name for all external users to connect to.
The firewall between all sites internally is completely open. All sites have Digicert ceritifcate. And installed correctly.
Active Directory Sites and Subnets are definitely configured correctly. I have tried enabling Integrated Auth via both console and poswershell.
But I still get:
Outlook Web App isn't available. If the problem continues, please contact your helpdesk.
The event viewer on the datacentre server throws this up:
The Client Access server "https://webmail.domainname.co.za/owa
" attempted to proxy Outlook Web App traffic for mailbox "/o=domainname/ou=Exchange
Administrative Group (FYDIBOHF23SPDLT)/cn=Recip
sername". This failed because no Client Access server with an Outlook Web App virtual directory configured for Kerberos authentication could be found in the Active Directory site of the mailbox.
Previously, webmail used to sit on the largest sites 2007 server as a seperate owa folder for external access and it worked fine with no issues for all other sites.