troubleshooting Question

SMTP Relay to Remote Active Directory Site.” and the last error is 451 4.4.0 Primary Target IP address responded

Avatar of Yashy
YashyFlag for United Kingdom of Great Britain and Northern Ireland asked on
ExchangeWindows OSActive Directory
7 Comments3 Solutions1345 ViewsLast Modified:
hi guys

I have two sites both on Exchange 2010, both on Windows 2012 R2. I've attached a screenshot of what I am seeing in the queues from Site B to Site A. Port 25 is definitely open. I can telnet. I have restarted both servers. So I don't understand what on earth is going on and why these queues are occurring.

I read that it could be self signed SSL related? So I've tried re-applying the SMTP service to the current certificate and restarted the Transport services, but still these queues remain.

Any help would be greatly appreciated guys,

Thanks for helping

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