At client`s site we have problem with a retired DC running NT4. Apparently there is a ghost on the network!!! When we shut down this host, the network is slightly slowing down. There is no DNS or DC relation with this host anymore, no share, no listening services. We even used a sniffer and no trafic has been catched destinated to the host during 60min.
If you ever got similar issue, as network administrator, when removing old server please let me know what was the cause? Will higher points to its mak if good answer is received