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Why do users lose exchange connectivity when I reboot one of my domain controllers?

Ok,

I've got a 2000 domain controller, and two 2003 domain controllers (one which runs exchange 2003).  Users have windows 2000 professional and outlook 2003.  When I reboot the 2000 domain controller, everyone loses exchange connectivity.  I found these two errors on the exchange servers error log:

this error occurs numerous times all at once:

Event Type:      Error
Event Source:      MSExchangeSA
Event Category:      RFR Interface
Event ID:      9074
Date:            5/6/2005
Time:            9:44:48 AM
User:            N/A
Computer:      EXCHANGE
Description:
The Directory Service Referral interface failed to service a client request. RFRI is returning the error code:[0x3f0].

For more information, click http://www.microsoft.com/contentredirect.asp.


Then, the second error occurs once:

Event Type:      Error
Event Source:      MSExchangeDSAccess
Event Category:      Topology
Event ID:      2103
Date:            5/6/2005
Time:            9:33:46 AM
User:            N/A
Computer:      EXCHANGE
Description:
Process MAD.EXE (PID=1436). All Global Catalog Servers in use are not responding:
scanserv.northerninsuring.com
 

For more information, click http://www.microsoft.com/contentredirect.asp.




The server that is referred to above is the one I rebooted.

The windows 2003 server that does not run exchange (its a file and app server) is the operations master.  I believe that all three domain controllers are global catalog servers so i don't know it says ALL global catalog servers in use are not responding.

I have read the MS articles related to the errors and followed all the steps and found nothing (ran policytest.exe, checked replication,etc etc)

Before I write a book, I'll end here.  Feel free to ask more details about my tcp/ip configs, etc or more on what i've tried.

Thanks

PS-Should I post this in networking instead or as well?
0
David Scott, MCSE
Asked:
David Scott, MCSE
1 Solution
 
Exchange_AdminCommented:
Upon first thought I would say that your Exchange server is pointing to the rebooted server as the DC and GC.
Although it may after a period of time start searching for a new DC/GC. I am not sure how long it will wait before it does this or how to change the time interval.

Hopefully someone else will add their ideas.
0
 
David Scott, MCSENetwork AdministratorAuthor Commented:
i think i found it.  turns out that the 2000 server was the only global catalog server in the domain.  I made both the 2003 servers global catalogs.  I am going to reboot the 2000 server again and see what happens

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