i work in W2K domain which has one DC. I wanted to move this DC into another one, and delete the original one.
So i tried first to transfert the 5 FSMO roles after promoting the new DC , and i couldn't. So i seize these 5 roles instead transfer them. then i put offline the first DC.
Now, after this migration, i wanted to defrag the Active directory Database (ntds.dit) by rebooting under "restore AD mode", and by using NTDSUTIL, which is the classical way of defragmentation.
after this operation, it was impossible to access to the objects of AD by using "User & computer AD" or "ADSI edit". it says, that's impossible to connect to the DC because the server is not operationnal. So i tried to join a computer to the domain, as a test of authentication, and it does work.
so i though first to restore to database, but i don't think that it's the source of the problem. even though i can't access physically to the objects, i can authenticate users and computers. It seems to me a DNS problem ??? what do you think ..??
NB: you had to know that on the original DC, i couldn't remotely open the snap in "User & computer AD", but locally, it did work.