Missing DCs from _sites container.

From: AVTechs (avtechs_at_aspenview.org)
Date: 11/18/04 

Date: Thu, 18 Nov 2004 13:05:04 -0800

We've noticed that our Windows 2000 Domain Controllers are mysteriously
disappearing from DNS. We have 14 DC's and it seems that there are always
the same 10 that disapear from the

DNS/Fwd Lookup Zones/"domain"/_msdcs/ds/_sites folder.

All other DC information in DNS is OK, only the above container is missing
the DC's. This causes users to home to the wrong server when logging in,
causing slow logins.

If we run a netdiag /l /fix on each individual missing servers, DNS is
repaired and the DC entries are placed back into DNS _sites folder.

We are trying to figure out what is causing these DC's to be removed from
DNS. Recently we have installed a new Exchange 2003 server. We noticed the
first time we ran ForestPrep and DomainPrep the same thing happened and we
had to run netdiag /fix on all the missing DC's. Since the first netdiag
/fix DNS has been OK. But we've just noticed that DC's are missing once
again and neither of those tools have been ran. Still searching around to
see how and why these entries would be delete/removed.

Any ideas would be helpful.

Avtechs

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