Avatar of Romadona
Romadona
 asked on

Exchange 2010 cannot send to Exchange 2007 in same organization (Coexsistence)

Dear expert

i've problem with sending mail from exchange 2010 (NLB and DAG) to Exchange 2007 (legacy) on same domain, same forest and same organization.

i've error that sound

"451.4.4.0 Primary target IP address responded with: "451.5.7.3 cannot achieve Exchange Server authentication. " Attempted failover to alternate host, but that did not succeed, either there are no alternate hosts, or delivery failed to all alternate hosts"


i've create receive connector on both exchange server 2010 and 2007 with authentication "exchange server" and Permission "legacy exchange Server, Exchange Server"

But still no luck ,

does anyone can help me please

Thanks
Exchange

Avatar of undefined
Last Comment
Romadona

8/22/2022 - Mon
elevationkevin

Try and restart the DNS Server service under Organization Configuration > Send Connectors > (your Send Connector name) > Properties > Network Tab > Check the box for "Use the Externam DNS Lookup settings on the transport server" Does that seem to help?
ASKER CERTIFIED SOLUTION
Chris

Log in or sign up to see answer
Become an EE member today7-DAY FREE TRIAL
Members can start a 7-Day Free trial then enjoy unlimited access to the platform
Sign up - Free for 7 days
or
Learn why we charge membership fees
We get it - no one likes a content blocker. Take one extra minute and find out why we block content.
Not exactly the question you had in mind?
Sign up for an EE membership and get your own personalized solution. With an EE membership, you can ask unlimited troubleshooting, research, or opinion questions.
ask a question
Romadona

ASKER
seems that ip address looping on some receive connector<br />old admin put network address on receive connector<br /><br />after remove it. sending email from Ex2k10 to legacy normall.<br /><br />thanks
All of life is about relationships, and EE has made a viirtual community a real community. It lifts everyone's boat
William Peck