troubleshooting Question

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

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Romadona asked on
3 Comments1 Solution1759 ViewsLast Modified:
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

Lead Infrastructure Architect

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