I have a Hub Transport Server (Windows 2003 SP2 R2 Standard x64) It is a domain member and is running Exchnage 2007 Mailbox, Hub and Client access roles.
I created an edge transport server on the DMZ. (I have allowed access to the hub transport box and tested all the ports needed, communication works) The Edge transport is a Windows 2008 x64 box.
All internet bound messages sit in the que on the hub transport and give the following error:-
422.214.171.124 Primary target IP address responded with 451 5.7.3 "cannot achive Exchange Server authentication" Attemplted Failover to alternate host, but that did not suceed. Either there are no alternate hosts or delivery failed to all alternate hosts.
There are no error messages in the event viewer
The Test-Edgesubscription cmd shows no errors from the hib transport.