My org has five E2K3 SP2 servers in a single routing group. The problem server is an active/passive cluster. All messages from the problem server, to the other four servers, stack up in outgoing queues. Clicking on each of the queues indicates "the connection was dropped by the remote host." The queued messages eventually expire with 4.4.7 NDRs. Messages from the other servers to the problem server are successful. If I move the exchange resources to the passive node, the queued messages get delivered successfully. If I move the exchange resources back to the problem server, the problem continues. Any ideas?
An update: Attempting to verify node 1 was the problem, I left the all the cluster resources on node 2 (normally passive) for several days . Now the same problem is occurring on node 2: - when node 2 is active, outgoing messages are held in queue - when resources are moved to node 1, mail flow is normal - when resources are returned to node 2, the problem continues I Turned on SMTP logging. Now I see event ID 4006 - Message delivery to the host '<Target server IP address>' failed while delivering to the remote domain '<Target server FQDN>' for the following reason: The connection was dropped by the remote host.
