External bound messages stuck in queue

Posted on 2012-08-24
Last Modified: 2012-08-24
We have a Exchange 2007 and 2010 CASHUB co-existing.  Right now on the 2007 CASHUB, I'm seeing a "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.

The 2010 is our main outbound server, I know it's some sort of authentication issues with the receive connectors but not sure how to proceed.

Please help!
Question by:randy915
    LVL 1

    Author Comment

    To clarify, we have mail stuck on the 2007 box to external addresses.
    LVL 63

    Accepted Solution

    Have you changed the connectors on either server from their default setting? Locked them down in any way, such as Ip address restriction.
    The Default Receive connector is usually used for inter-server connectivity, with Exchange Server authentication type enabled.

    LVL 1

    Author Comment

    I fixed the issue by removing the Default receive connector on my 2010 and recreating it from scratch.

    As a reference for others, an out of the box Default receive connector looks like this:

    FQDN =
    Local IP address to receive mail = NIC IP on port 25
    Receive mail from IP address = to
    Authentication: TLS, Basic, Offer Basic after TLS, Exchange Server, Integrated Win Auth
    Permission Groups:  Exchange users

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