Hello All,
We just recently introduced Exchange 2013 into a mixed Exchange 2010/2007 environment with TMG 2010. We had no issues with TMG and any Exchange 2010/2007 protocol.
We installed Exchange 2013, created new TMG rules as per the MS Technet articles and pointed eveyrthing on the TMG server to the Exchange 2013 CAS roles via a TMG web farm.
Everything is working correctly on all Exchange 2013/2010/2007 servers *except* for Outlook Anywhere for the test mailbox that we have on the Exchage 2013 server. We cannot successfully configure a OA session the the 2013 mailbox - it keeps prompting for credentials. When we direct the Outlook client to go directly to an Exchange 2013 server via a hosts file, OA works without issue so it appears to be something related to TMG.
So we've spent a bunch of time checking settings and trying different combinations of settings on both the TMG policy for OA and the Exchange 2013 CAS roles without any luck - we cant seem to authenticate the OA client and establish a session.
Interestingly enough if an Exchange 2010 user with the correct rights tries to open the Exchange 2013 test mailbox, they will eventually be able to open it but only after a delay of a minute or two.
Any ideas?
Does anyone have a set of working TMG and Exchange 2013 settings for a mixed environment that they can share here ?
Thanks