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Migration from Exchange 2003 to 2010 leads to block of all incoming e-mail after removal of Routing Group Connector

I recently came close to completing migration from Exchange 2003 to 2010, moving from a Windows 2003 platform to Windows 2012. After I had moved all of the mailboxes everything was working fine with the systems connected. Now I need to remove Exchange 2003 from the old server. However, as soon as I execute the [Get-RoutingGroupConnector | Remove-RoutingGroupConnector] command in PowerShell on the 2010 system, all incoming e-mail is blocked somehow. Outbound email is fine. Restoring the RGC fixes the problem, but I don't want to run the old server forever. I don't see any problems with SMTP or firewalls. MX points to the new server. Please help me cut the cord to my old server before it dies on its own.

SOLUTION

Alan Hardisty

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VB ITS

In the Exchange Management Console on the Exchange 2010 server > expand Server Configuration > click on Hub Transport > click on the name of your Exchange 2010 server in the top pane > in the Receive Connectors tab underneath right click on the Default <EX2010 Server Name> > Properties > Permissions Group tab > make sure the Anonymous users box is ticked.

JohnDoctor

ASKER

Thanks, but anonymous user permission was enabled in default receive connector and the problem persisted.

VB ITS

Did you update the port forwarding rule on your firewall as Alan suggested above to forward SMTP traffic (port 25) to the IP address of your new Exchange server?

JohnDoctor

ASKER

Thank you, the firewall was already redirecting port 25 to the new server and we cannot get incoming email without the RGC.

ASKER CERTIFIED SOLUTION

VB ITS

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