We have the following setup:EXCH - Server 2003 SP2 with Echange 2003 SP2DC1 - Server 2003 SP2, DC, GCDC2 - Server 2008, DC, GCDC3 - Server 2003, DC, GCEXCH lists DC1 in the Directory Access but not DC2 or DC3. What should I check?

Are all the correct ports open on the firewall to allow access to these new DCs?Mark Morowczynski|MCT| MCSE 2003:Messaging, Security|MCITP:ES, SA,EA|MCTS:Windows Mobile Admin|Security+|http://almostdailytech.com

- Have you rebooted the 2008 DC/GC after replication is completed. - Check event id 2080 which gives you more clue based on KB316300 -http://support.microsoft.com/kb/316300 - IfSACL right column in event 2080 shows 0 then you have to verify "Manage auditing and security log" in GPO as per below similar thread... http://social.technet.microsoft.com/Forums/en-US/exchangesvrgeneral/thread/a908baa1-3ba1-4dc3-9197-ee75bbef9350 Amit Tank | MVP Exchange Server | MCITP: EMA | MCSA: M | http://ExchangeShare.WordPress.com

It sounds like the answer to this is "yes", but are the new DC's in the same Active Directory site? Jim McBee - Blog - http://mostlyexchange.blogspot.com

Has the Automatically discover servers been checked in the Directory Access tab (Gray by default)? Please run DCDiag /v /a and NetDiag /v to check the health of DC and connection to DC from the exchange server

markmorow - There is no firewall between the DCsAmit Tank- Replication completed long ago, the servers have been up for months. Just now noticed they were not listed in DA as we had an issue with DC1. Jim McBee - You are correct, the answer is yes.James-Lou- I will try those tomorrow. Very busy day today with other things

I think that James' suggestion is probably spot-on. I thought about the possibility of someone manually configuring your Exchange servers to use specific DC/GCs after the fact. Those things always hit you when you are driving or something and can't get online. :-)Jim McBee - Blog - http://mostlyexchange.blogspot.com

James-Lou, what exactly am I looking for when I run those? Everything passes, and the issues it reports are related to printer drivers.Automatically discover servers is checked.

Quote: Just now noticed they were not listed in DA as we had an issue with DC1 Whats the issue with DC1? Please run ExBPA against the exchange server for a health check

Please follow the To verify that SRV resource records are registered for the domain controller in this article to confirm if SRV records have been registered properly on the primary DNS server of the exchange server Have you turned on diagnostics logging for DSAccess Topology as Amit suggested, and see what shows up in the 2080 event? Could you post the event at here for analyzing?

It sounds like the answer to this is "yes", but are the new DC's in the same Active Directory site? Jim McBee - Blog - http://mostlyexchange.blogspot.com I was wrong. I thought you meant forest for some reason. Had one of our outside support folks over and he pointed out the same thing. I also manually added the GC's DC2 and DC3 and when DC1 when down yesterday, my exhange server didn't crash. Imagine that...