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Mobile device users prompted for password when connecting to Exchange 2003 through 2010 CAS

Posted on 2012-03-23
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Last Modified: 2012-03-26
We are running in coexistence with Exchange 2010 and 2003.  I have set up the legacy namespace for OWA access and initially we were getting an "unspecified error" message when attempting to connect to OWA 2003 through our CAS array.  I found a TID that contained the fix, enabling forms based authentication on the 2003 OWA Exchange Virtual Server.  After enabling FBA we could connect to both 2010 and 2003 accounts through the CAS array using a web browser.  We also verified that our Exchange 2010 users with Android, iPhone and tablet devices could use their mail client with the external URL that we use for OWA set as their mail server (mail.xxxx.com).  However we found that our 2003 mailbox users got a pop-up window asking for their password, entering their network password did not work.  We tried recreating an iPhone user's mail profile and after entering her credentials she got a message that the server was unable to validate authentication.

I'm wondering if this is because we enabled FBA on the 2003 OWA server but I'm not sure how to resolve this.  We need our 2003 users to be able to access OWA through a web browser and still be able to use their mobile device mail clients.
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Question by:Marc_Johnson
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Expert Comment

by:Allan Martins
ID: 37758744
tried using their credentials with the full username path (domainname\username) ?
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Expert Comment

by:Amit
ID: 37758763
You need to use form based authentication only once. Prefer is 2010
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Assisted Solution

by:Amit
Amit earned 1000 total points
ID: 37758799
Ignore my above post, that was for if we have exchange 2010 in multiple sites. For coexist, follow this kb

http://technet.microsoft.com/en-us/library/ee332348.aspx

Read all steps and apply it.
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Accepted Solution

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endital1097 earned 1000 total points
ID: 37760506
you need to ensure that you have Windows integrated authentication enabled on the Microsoft-Server-ActiveSync virtual directory on your 2003 backend server
this needs to be set thru Exchange System Manager

you may need to following hotfix to enable this
http://support.microsoft.com/kb/937031
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Author Closing Comment

by:Marc_Johnson
ID: 37766881
That was exactly it, I did not have integrated Windows authentication enabled on the ActiveSync on the 2003 front end server.  Once I enabled this our 2003 users were able to connect to Exchange through their mobile devices.  I am accepting the solutions for both amitkulshrestha and  endital1097 because they both referenced the fix in their solutions.  

Much thanks to both of you for the solution!
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Author Comment

by:Marc_Johnson
ID: 37766970
I also forgot to mention that I did apply the hotfix referred to in both solutions above before enabling Windows integrated authentication.  Note: if you are running Exchange 2003 in a clustered environment you need to stop the cluster service before applying the hotfix to the nodes in the cluster.
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Expert Comment

by:Amit
ID: 37767359
Thanks for your valuable inputs.
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