troubleshooting Question

Unable to send from Exchange 2010 to Exchange 2003 Coexistence mode

Avatar of Sean Gaughan
Sean Gaughan asked on
Exchange
10 Comments3 Solutions126 ViewsLast Modified:
I get the error:

 "451.4.4.0 Primary target IP address responded with 421.4.4.2 Connection dropped due to SocketError"

I am able to send from 2003 to 2010, and from 2010 to internet email addresses and back again however the only route that doesnt work is from 2010 to 2003.

I have created a bidirectional RGC but still the same error appears. Googling this issue only leads to dead ends.

I would massively appreciate it if anyone could help!
ASKER CERTIFIED SOLUTION
Amit
IT Architect
Join our community to see this answer!
Unlock 3 Answers and 10 Comments.
Start Free Trial
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 3 Answers and 10 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros