Exchang 2010


I have a new Exchange 2010 Server which is having strange problems.  Some users (but not all) from time to time are being disconnected or outlook hangs and has to be forced to close  before it will work.  I checked exchange and I found the following error messages:

1)  The Security System could not establish a secured connection with the server ldap/domain.  No authentication protocol was available.

2)  Process MAD.exe (PID=4476).  Exchange Active Directory Provider lost contact with domain controller dc.domain.com.  Error was 0x80040951(LDAP_SERVER_DOWN (Cannot contact the LDAP server)) 0.  Exchange Active Directory Provider will attempt to reconnect with this domain controller when it is reachable.

3)  Proces MSExchangeMailboxAssistants.exe (PID=2624).  Exchange Active Directory Provider lost contact with DC.domain.com.  Error was 0x34 (Unavailable) (Active Directory response:  The server is unavailable).  Exchange Active Directory Provider will attempt to reconnect with this domain controller when it is reachable.

Once this machine is restarted, it works fine for another few hours, then it starts playing up again.  I am in the middle of removing two Windows 2003 DCs but the Exchange (which is virtual hyper v server) is currently pointing to our Windows 2008 DC.

Any thoughts?

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basil2912Connect With a Mentor Commented:
1: Check protocols/ports/firewalls:

http://social.technet.microsoft.com/wiki/contents/articles/584.active-directory-replication-over-firewalls.aspx and http://support.microsoft.com/kb/832017

2. Check replication health (dcdiag on DC's), repadmin /syncall.

3.Make sure there is a GC available in the same site as exchange (if you have several sites).

4. Use for a while static GC assignment and see if issue reproduces.Static DC
And, I agree, a copy/paste of informational event ID 2080 event should show if there are any issues with CG's and Exchange communication.
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
What  is the Exchange version ?
How many DC\GC's do we have ? Can you share 2080

- Rancy
minniejpAuthor Commented:
Its Exchange 2010 and we have four domain controllers, three of which are GC.

Not sure what you mean by "can you share 2080"?
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can you correlate the errors on exchange to any errors on the domain controller?
minniejpAuthor Commented:
No, nothing shows up on the DCs
ChrisConnect With a Mentor Commented:
can you DC diag and make sure there are no errors there.

It would be worth doing a simple test like continuous ping from the exchange server to the DC's just in case the Hyper V networking is not stable and drops enough to cause exchange issues
Manpreet SIngh KhatraConnect With a Mentor Solutions Architect, Project LeadCommented:
2080 is a event ID in the Application log which tell which DC\GC's are capable to work with Exchange

- Rancy
minniejpAuthor Commented:
Thanks all, problem was with DNS
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