Hi, We are having Primary domain controller in Mumbai and created Additional domain controller in Bangalore.
Operating system in both server : Windows 2008 Server STD SP2 64Bit
Few months ago this ADC in Bangalore restarting frequently. So we tried to repair os through bootable disk but not worked. Then we restored the image backup which we took earlier using windows server backup utility. After restoration we were able to login on the server through domain\administrator credential but if we restart the server or try to login on next day server not accepting any administrative credential and unable to login on server. It just giving error that username or password is incorrect.
While suffering this issue we check some things like that replication between mumbai to bangalore and vice versa working. Because whenever banglore location needs to create or delete any domain user from active directory if we delete here in mumbai server it works in banglore network or if any user's account getting locked we are able to unlocked it through mumbai server.
Please help..