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Exchange 2007 loses connectivity with AD when DC goes down

We have and Exchange 2007 server that does not allow users to access their mailboxes when one of our 2 DCs goes offline.  Both DCs in this site are configured and GCs  One DC is running Server 2008 SP2, the other is Server 2008 R2.
1 Solution
Tony GiangrecoCommented:
It sounds like those Exchange users are getting responded to by one the DC that is going down. Normally, users get distributed between multiple DC's when there is more than one available.

I'd check to see why no systems are getting picked up by the 2nd DC.

I'd also check the dns on the exchange server and see if it's using the same servers and the exchange users.
piyushranusriSystem Cloud SpecialistCommented:
could you get chance to see the event log to exchange server and what is their event ID ?

did you get this event ID

Event ID 40961 Info:

Log Name:      System
Source:        LsaSrv
Date:          xxxxxxxxxxxx
Event ID:      40961
Task Category: None
Level:         Warning
User:          SYSTEM
Computer:      xxxxxxx.com

The Security System could not establish a secured connection with the server ldap/ DCMain3008.xxxxxxx.com/xxxxx.com@xxxxxx.COM. No authentication protocol was available.

here is the same MS article on this event ID :
1. http://support.microsoft.com/kb/939820
2. http://www.opsvault.com/troubleshooting-microsoft-exchange-outlook-connectivity-issues/

did you upgade your AD/DNS in these time and have not setup the correct DNS with exchange
Can you please post the results of the following:

1) dcdiag /v /e
2) repadmin /showrepl
3) The FSMO roles held by each AD server: http://www.petri.co.il/determining_fsmo_role_holders.htm

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