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Installed 2010 Edge Transport and now getting 451 4.4.0 on 2007 Hub Transport

Posted on 2011-09-20
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Last Modified: 2012-05-12
Greetings,

I'm in the middle of an Exchange 2003 / 2007 to 2010 transition.  Mailflow was working between all 3 environments.  I installed an Exchange 2010 Edge Transport server in the DMZ, created a new subscription and applied to internal org via Hub Transport 2010 server.  Test-EdgeSynchronization and Start-Syncrhonization were successful but mail starts queuing up on the Hub transport server with error 451 4.4.0 and 451 5.7.3 Cannot achieve Exchange Server authentication.

Any ideas what may be wrong?
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Question by:loudelat
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Expert Comment

by:sunnyc7
ID: 36571531
Did you open port 50636 from DMZ to Internal network for Edge Sync ?
Check the port requirements here:
http://technet.microsoft.com/en-us/library/cc526574.aspx

I'd restart AD LDS on Edge Server and give it a shot.

There are some guides here:
http://technet.microsoft.com/en-us/library/bb124896(EXCHG.80).aspx

and this kb
http://support.microsoft.com/kb/976108


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Author Comment

by:loudelat
ID: 36571669
Thanks. Required ports are open. DNS resolution is successful. Restarted services but still not working.
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Accepted Solution

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loudelat earned 0 total points
ID: 36575780
Issue resolved. ASA firewall was performing fixup on smtp which was causing mail delivery issues. Disabled fixup and all is well again.
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Author Closing Comment

by:loudelat
ID: 36597790
Resolved by submitter.
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Author Comment

by:loudelat
ID: 36575789
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by:sunnyc7
ID: 36575931
Thanks for updating the ticket with the solution.
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