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When I attempt to add a mailbox database copy to another mailbox server, it returns "Error: Exception has been thrown by the target of an invocation." The event viewer on the source server logs an event ID 10009, DistributedCOM: DCOM was unable to communicate with the computer [Server] using any of the configured protocols. I've rebooted both mailbox servers, no change. I have 8 other replicated mailbox databases between these two servers that can fail over to each other without issues. Any thoughts?

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up vote 1 down vote accepted

Thanks for your response - it was indeed a firewall issue. I'm using CheckPoint UTM1 security appliances and running VPN between sites. After I re-installed policy, the issue cleared up.

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It turns out that the Smart Defense feature on the CheckPoint firewalls was rejecting some of the DCE-RPC packets coming through the VPN even though the configuration was set to allow all traffic through VPN connections. They do have a hotfix for this issue - see CheckPoint's article sk42402 for more details. – jjrab May 26 '11 at 14:26

Are there any local software firewalls running? I would disable them between the two, and try again. If successful, you know the answer.

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