We have had similiar problems at our place. Basically if your PDC goes down you must immediatley promote a BDC to take its place, otherwise your get problems galore as the BDC are only copied of the PDC and cannot been wrote too i.e change passwords etc etc. When you bring the old PDC back up it will become a BDC till you prmote it.
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If at first you don't succeed, try again. Then quit. There's no use being a damn fool about it. - W.C Fields
