Exchange 2007 Hub Transport can not contact Active Directory

We recently built a lab to mock our production environment.  For some reason, the Hub Transport server does not appear to be talking to Active Directory.  If I send an email from the mailbox server, it just hangs in the Hub Transport Queue.  Event Viewer shows....

Source: MSExchangeMailSubmis
Category: MSExchangeMailSubmiss
Event ID: 1009
User: N/A
Computer: Hub Transport

Description:

The Microsoft Exchange Mail Submission service is currently unable to contact any Hub Transport servers in the local Active Directory site.  The servers may be too busy to accept new connections at this time.  

From the research I've done and the possible fixes I've ran across, I've already....

Verified the local disks are not low on storage.
Made sure no Firewall filtering is taking place for network data or blocking RPC.
Exchange is not in a perimeter network.
Rebooted the Domain Controller, Hub Transport and Mailbox servers.
Verified Microsoft Exchange AD Services and Transport Services are running.

Has anybody else ran across this problem?

Thanks.

Rob
mccrear1Asked:
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mccrear1Connect With a Mentor Author Commented:
I gave up and rebuilt the Hub Transport Server from the ground up.  It's now working.
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mohdabsarCommented:
not sure..
however give a try to Mail Flow Troubleshooter
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mohdabsarCommented:
which is availble in EMC under Toolbox
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mccrear1Author Commented:
After trying the Mail Flow Troubleshooter, all I received was......."Messages pending Submission, queueu backing up".....followed by........"No submission queues issues identified".
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mccrear1Author Commented:
I tried disabling / enabling the transport agent, but no luck.  Curses.

I ran the Test-SystemHealth, and all I received back was..."Background Value missing, could cause size discrepancies".

These are the other steps I've tried from suggestions I've found on the Internet.

Verify all services are running on all servers.
Verify Firewall Filters are not blocking network traffic.
Mailbox and Hub Transport are not in a perimeter network.
Plenty of hard drive space on all servers.
Get-Transport Agent, then disable / enable each Agent one by one.
From mailbox server, telnet hub-server 25 (successful connection).
Verify Send/Receive connectors are configured properly.
Change Receive connectors to allow anonymous users.
Verify both Domain Controllers are Global Catalogs.
Reboot all Domain Controllers and Exchange 2007 servers.

Verify the groups Everyone, Administrators, Backup Operators, Power Users and Users are in Group Policy Object MMC, under local computer policy - computer configuaration - windows settings - security settings - local policies - user rights management - access this computer from the network.

The only other thing I've found so far is someone saying...."I ran into this problem, spent 5 hours on the phone with Microsoft to modify the registry.  It was determined that the Hub Transport Install was corrupt".

Ugh.

Rob
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