site completely down but other sites available

[Guest]

i am running a win2k domain with three sites. there are three dc's in each
site with replication setup between all sites. i recently had a dc that was
unresponsive due to cpu/memory usage and it appears the netlogon and
replication of this machine had stopped responding as well. this appeared to
have some affect on the other 2 dc's in the site as well. all users at that
site could not login and the mmc for ad users and computers could not be
initialized. I am wondering what would have caused such a debacle when the
other 2 dc's were not having any issues other than talking to the third dc.
also can't users go to a dc in another site if there are issues with dc's in
there site? it does not seem to make sense that a site can be completely
taken down this easily. any info is much appreciated. thanks!

 

[Denis Wong @ Hong Kong]

Pls check for the event log and post back any revelant event.

br,
Denis

 

[Guest]

these are the events from the dc having trouble, there was not anything on
the other 2 dc's to speak of.

Event Type: Warning
Event Source: NTDS General
Event Category: Replication
Event ID: 1079
Date: 03/26/2005
Time: 10:20:51 AM
User: CWC\CDADC03$
Computer: CDADC01
Description:
Internal event: Active Directory could not allocate enough memory to process
replication tasks. Replication might be affected until more memory is
available.

User Action
Increase the amount of physical memory or virtual memory and restart this
domain controller.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.

Event Type: Error
Event Source: NTDS General
Event Category: Global Catalog
Event ID: 1126
Date: 03/26/2005
Time: 10:23:33 AM
User: NT AUTHORITY\ANONYMOUS LOGON
Computer: CDADC01
Description:
Active Directory was unable to establish a connection with the global
catalog.

Additional Data
Error value:
1792 An attempt was made to logon, but the network logon service was not
started.
Internal ID:
3200caf

User Action:
Make sure a global catalog is available in the forest, and is reachable from
this domain controller. You may use the nltest utility to diagnose this
problem.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.

 

[Denis Wong @ Hong Kong]

You have problem because your netlogon service is not running and the GC is
not reachable. You need to find out why netlogon is not started (or stopped
with some reason). Try to use nltest to troubleshoot.

How Domain Controllers Are Located in Windows
http://support.microsoft.com/?kbid=247811

For event 1079, there is not much info. You may be running out of virtual
memory, or you may have other problem such as memory leakage. Try to enlarge
your virtual memory and see.

br,
Denis