OWA thru single Front-End server and two back-end servers ( Problem for some users )

Posted on 2006-06-01
Last Modified: 2008-03-06
I have a two location setup.  The main location has a Front-end server in a DMZ ( and a Back-end server on the LAN ( ).  The remote location is connected via a VPN tunnel with one back-end server ( ).  The problem is this:  Any users located on the remote Exchange server are unable to authenticate from the Internet when trying to use OWA on the Front-End server.  While users from the main site Exchange server can login to OWA just fine from the Internet.
All subnets have full connectivity thru the VPN.  All the back-end servers are Exchange 2003 SP2 Enterprise.  The Front-end is 2003 Standard.  OWA works if the remote server users access OWA on the remote server directly (

What could be the issue?  
Question by:OLMECIAN
    LVL 4

    Expert Comment

    The first thing that pops into my head when I read this is kerberos over UDP.
    Here's an article that describes this a little bit:


    Author Comment

    Thank you for the response.  I just corrected the issue right now just by restarting the Web server service on the Front-end server.  Who would of thought.

    Accepted Solution

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