I have a problem with the autodiscover service changing server names all the time.
One domain spread across 3 separate sites each with an exchange 2007 serer and AD server connected via VPN. Each Exchange server has the following roles: HUB Transport, Client Access and Mailbox. I have the correct certificate installed and it can resolve autodiscover.domain.com, site1.domain.com, site2.domain.com and site3.domain.com +mail etc... The autodiscover A record points to site1 both externally and internally.
The problem Im having is that autodiscover works both internally and externally but then at random times it will change clients outlook setting to one of the other servers\sites that there mailbox does not reside on. E.g. A remote user with a mailbox on site1\server1 connects and outlook works and discovers the correct servers site1.domain.com then a week later they will open outlook and it will constantly prompt the user for a password but wont authenticate, if I check the outlook settings I see its been changed to site2.domain.com instead of site1.domain.com where there mailbox sits. If I change it back to site1.domain.com then they can work again as normal. There is no pattern to when it changes and which servers it will change to, sometimes its site 1, then site3 then site1 again or site2...
Is there away to specify that a user on a certain mailbox store always connects to that server? Or remove a rule to say that they can use any server name within outlook as they are part of the same domain?
If you require any more info or if I havent made myself clear please let me know. Thanks in advance for your help.