Exchange 2003 to 2010 migration Error 5015 & 5016

Receiving Event ID 5015 & 5016 on Exchange 2010.
The Active Directory topology service could not discover any route to connector (CN=Internet Mail SMTP Connector (Server2003), ....

In the beginning stages of the migration. There is a barracuda spam/virus fw in place. Changed config to point to Exchg 2010 for receiving email. No mail flow at this point.

As I understand it, Exchg2010 can not communicate with Exchg2003.

Any help is appreciated.
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Mohammed HamadaConnect With a Mentor Senior IT ConsultantCommented:
The Message means Exchange cannot determine a route or a connector to the final destination.

Can you check if send connector you're talking about is marked as down.

Can you also nslookup the destination server to check if it resolves with your dns ? And telnet check if you have connectivity as well?

Make sure that you also have connectivity between both servers without any issue. Try disabling firewalls temporarily.
rojiruAuthor Commented:
No. But thanks. Will look more in depth in the am. Did not expect such an error out of the gate. Looks like all info was pulled across.
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rojiruAuthor Commented:
Inbound mail is working, though I switched the barracuda back to point to the Exchg20003 server. Outbound mail is sitting in the queue Messages with an unreachable destination.

On Exchg2010 there is the send connector created from Exchg2003. If they were able to communicate to exchange information, why the problem with the send connector now?
rojiruAuthor Commented:
I got the mail to flow both inbound and outbound. It appears that there was never a route connector configured on the 2003 box. Creating one solved the mail flow issue. Hopefully that will be all the problems. One question for you. Can I start migrating the mailboxes during business hours, or is it better after business close?

Mohammed HamadaSenior IT ConsultantCommented:
If it was down to me, I would certainly do it after business hours!
rojiruAuthor Commented:
Thanks for your help, it is greatly appreciated. I was thinking after hours, so just wanted some backup from an expert. :) Anyways, will continue with this saga tonight. Hopefully no more issues.

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