We have a Database sever running Microsoft Reporting Services on our network. The users with browser permissions on the server come from our AD Domain, and from a second AD Domain we share trust with (our sister office connecting to us through a VPN.)
Periodically, all the users from the second AD Domain will just drop from the server. When this happens, we cannot readd the users unless we reboot the server. Since this is a production server this can be difficult at times to arrange.
Not being a network admin, I am unsure as to what could be the cause of this problem or how to go about diagnosing it. Any assistance will be helpful.