How can i find which Domain controller is being used by Exchange.?

Hi,

How can i find which Domain controller is being used by Exchange.?
I have an Exchange 2007 server and 2 Dc's. How can i find which DC is being used.
And
Will Outlook use a DC to authenticate.
Now the 2 Dc's are Off. Outlook goes on asking for password. is this because the dc's are off?

Regards
Sharath
LVL 11
bsharathAsked:
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Alan HardistyCo-OwnerCommented:
Please refer to tip 1 from this page:

http://msexchangeteam.com/archive/2006/10/20/429233.aspx
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AniDXBCommented:
try nslookup from command prompt
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Mahmoud SabryCommented:
to know the Dc that exchange server use, in EMC go to Server configuration, select any server of ur servers, right click, properties, go to system settings to see current domain controllers and Global catalog servers that are used by exchange server

without Domain controller, exchange server at all will not work properly not only outlook, you must keep at least one DC running
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MegaNuk3Commented:
To see exactly which one it is currently talking to have a look at this article:
http://www.msexchange.org/tutorials/Exchange-System-Manager-Domain-Controller-Selection.html
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MegaNuk3Commented:
hmmm, the article I posted above is for working out which DC ESM is talking to, not Exchange.

You can however use similar methods to find out which DC/GCs Exchange is talking to:
1.) find the PID of MAD.exe (Exchange System Attendant)
2.) netstat -ano | findstr "<PID>" >>MAD.txt
3.) findstr /i ":389 :3268" mad.txt >>DCGC.txt
4.) findstr /i "ESTABLISHED" DCGC.txt

the above will show all the DC(port 389) & GCs(port 3268) your MAD.exe (Exchange System Attendant) has an open connection with.
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Khurram Ullah KhanCommented:
It is very simple, go to event viewer and see the last occurance of Event ID 2150. it will show you exchange is currently using which DC and GC.
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