I was told to post here from the Exchange 2010 forum.
We recently installed Exchange 2010 into a Windows
virtualized 2008 TS environment which previously had no Exchange.
Everything was ok at first and then a situation
arose where the DC went into Save mode during Windows 2008 Server backup and authentication problems began - users logged in at time of DC Save state happened were asked to enter credentials and then rejected with correct credentials. Some managed to log back
in after several attempts. Some did not. This problem is now widespread and random even though DC Save has not occurred again. Users are asked for name/password and some are rejected many times before getting in and others get in - and then the users
who could get in can't the next day and vice versa. And as well some time in the middle of a session the user is asked for his name and password and again can either be accepted or rejected after several attempts. The other fact here is that Outlook
Web Access works without a problem for all users. Any ideas as to what is going on?