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

JohnDoctor
JohnDoctor used Ask the Experts™
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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.
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Alan HardistyCo-Owner
Top Expert 2011
Commented:
Did you redirect Port 25 from the old Exchange 2003 server to the new Exchange 2010 server on your firewall?

Have you setup a Receive Connector on your new Exchange 2010 server with at least anonymous authentication enabled?

Alan
VB ITSSpecialist Consultant
Top Expert 2014

Commented:
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> > PropertiesPermissions Group tab > make sure the Anonymous users box is ticked.
Receive-Connector.jpg

Author

Commented:
Thanks, but anonymous user permission was enabled in default receive connector and the problem persisted.
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VB ITSSpecialist Consultant
Top Expert 2014

Commented:
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?

Author

Commented:
Thank you, the firewall was already redirecting port 25 to the new server and we cannot get incoming email without the RGC.
Specialist Consultant
Top Expert 2014
Commented:
Doesn't really make any sense. Just to confirm, emails sent to your company.com email address will reach your firewall > Exchange servers and that's it? Do you have anything else within your network that might handle SMTP traffic?

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