Exchange Routing Group Connectors Failing

I applied some MS updates last night and now mail is stuck between my DC's. I have 3 sites - TPA, ORL, and ATL. Each site has connectors TPA -> ORL, ATL > TPA - etc...

In System Manager I see a queue building up for "ORL-to-TPA (Routing Group Connector)" with a status of "The remote server did not respond to a connection attempt."

I can't find anything in Event Viewer. Dcdiag is running ok. The connectors appear to be setup correctly. I can ping all the DC's by name from eachother.

Please help!
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ob1_Asked:
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Stephen CroftTechnical ArchitectCommented:
as a guess I would imagine that the applied updates have firewalled your TPA server's somehow.

Check there is no firewall running, and try creating a new RGC between the two sites and seeing if you can route over that.
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Stephen CroftTechnical ArchitectCommented:
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Stephen CroftTechnical ArchitectCommented:
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Would say just go ahead and try creating a new RGC .
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ob1_Author Commented:
If I create a new RGC will the mail stuck in queue get delivered or go back with NDR's?
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Connector would also have a queue folder in the Windows where it would sav ethe files.
For Example SMTP virtual server holds the files in VSI queues folder in the windows explorer Just have a look at the Windows explorer and check. They would be xml files, if i'm not wrong.
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ob1_Author Commented:
Yes there is mail in queue - but will it get re-routed through the new connector when I create it?
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Stephen CroftTechnical ArchitectCommented:
Not automatically, no.

However you could try to locate the email files and move them to the queue for your new connector. Or, once you have your new connector working you could then go back and compare the two to change your original one to work :)
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
As i said that there would be a folder in the windows explorer that would hold the mails in xml files and you can now pick them up from that location and put them in the queues folder of the new RGC.
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ob1_Author Commented:
There was some kind of DNS corruption going on. We had to create a hosts file on each DC and flush/re-register DNS. Re-creating the RGC may have worked though - thanks for the help.
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