Exchange 2007 server not able to communicate with DC

Can you check the eventviewer

I have, not much going on there other than this:

Process MSEXCHANGEADTOPOLOGYSERVICE.EXE (PID=2040). Topology discovery failed, error 0x80040952 (LDAP_LOCAL_ERROR (Client-side internal error or bad LDAP message)). Look up the Lightweight Directory Access Protocol (LDAP) error code specified in the event description. To do this, use Microsoft Knowledge Base article 218185, "Microsoft LDAP Error Codes." Use the information in that article to learn more about the cause and resolution to this error. Use the Ping or PathPing command-line tools to test network connectivity to local domain controllers.

Also once the server is up, the services is not fully starting and is hanging for a long time.

What do you suggest we do to fix this problem?

Regards,

introlux

First of all you check it after reboot all server. then here is some solution may this will help you.

You only have one GC in your site A which is a single point of failure. Make your DC-A a GC as well.

Make sure dcdiag works fine and that there are no replication issues. Bounce your Exchange server (after hours).

Worse come, you can give a static list of your domain controllers and GCs using Set-ADServerSettings

for more
 http://community.spiceworks.com/topic/134941-exchange-2010-ad-topology-failures-all-domain-controllers-unavailable

https://exchangemaster.wordpress.com/2010/01/27/exchange-2007-installed-on-2008-dc-cant-communicate-with-2008-domain-controller-itself/

Morning,

Merry Christmas, what's odd, when I reboot all three DC's, I am able to log on again.

Any idea?

introlux

Its deffo a DC issue, we have run LOL and received the following error for some dc's:

there are no endpoint available from the endpoint mapper

Any idea?