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HUB transport role in DAG

Posted on 2011-09-05
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Last Modified: 2012-05-12
I have two Exchange servers. One of them has CAS, HUB, MB roles. Another one has HUB, MB roles. These servers are in DAG.

Before current config there there was only one HUB server and messages were sending normally.

After I installed HUB server on second server messages can be send only through old HUB server and when they are sending through new one they hangs in queue with error:

Delivery Type DnsConnectorDelivery

451 4.4.0 Primary target IP address responded with: "421 4.2.1 Unable to connect." Attempted failover to alternate host, but that did not suceed. Either there are no alternate hosts, or delivery failed to all alternate hosts.

Incoming messages passes normally.

Send connectors are similar for both HUB servers.

What can cause such a problem?
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Question by:roma_vt
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Accepted Solution

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Busbar earned 250 total points
ID: 36483279
did you allow the second server to resolve DNS and connect over port 25 to external hosts
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Author Comment

by:roma_vt
ID: 36483290
=))))) Yes, I'm idiot! This is so obvious and I forgot to open port 25! Thanks a lot busbar!
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Author Closing Comment

by:roma_vt
ID: 36483291
this full solution
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LVL 33

Expert Comment

by:Busbar
ID: 36483296
you welcome ;)
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