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Exchange 2007 OWA Proxy Configuration Not Working

Posted on 2009-07-09
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Last Modified: 2012-05-07
I have a domain, test.com, with two sites. Exchange 2007 in each site. I want to enable CAS to CAS proxying, because there's only going to be one internet facing server. (lets just call them t1, t2. t1 is internet facing.)

Internal and external OWA requests work as expected for t1. Only internal requests work for t2. T2 does not have an external owa URL specified in exchange. Additionally, t2 has IWA set for the exchange OWA authentication, and the OWA virtual directory has IWA as well. Again, t2 is not internet facing.

t1 is configured with FormsBased Authentication for OWA in exchange, and IWA and Basic auth in the OWA virtual directory in IIS.

When a user logs into OWA using the internet facing URL hosted by t1 (with a mailbox residing on t2), I get the following message: Outlook Web Access is not available. If the problem continues, contact technical support for your organization and tell them the following: There is no Microsoft Exchange Client Access server that has the necessary configuration in the Active Directory site where the mailbox is stored.

Both Exchange servers are 2007, and both have the CAS and MAILBOX roles. I've read all of the MS documentation, read the Exchange blog articles, and read articles on EE regarding this exact issue to a t, still no dice. Any ideas?
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Question by:supportlansmart
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Expert Comment

by:Npatang
ID: 24815996
Make sure that Both the CAS servers have the same updates installed.. make sure SSL is enabled on the OWA Virtual directories on both the Servers :)

What are you getting in app logs
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Author Comment

by:supportlansmart
ID: 24816463
In the logs, I see the mailbox I am testing with has logon errors stating the mailbox is in the process of being moved. (It isn't). It shows up in the disconnected mailbox list on server t1. I run the following to remove the disconnected mailbox,

Remove-Mailbox -Database sg4db1 -StoreMailboxIdentity e0c4ab75-f267-407a-ba01-add3615bd0e0 -confirm:$false

and I get an error saying it's connected.... I'll try a different account.
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Expert Comment

by:Npatang
ID: 24816498
Have you tried with any other Mailbox on the box
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Author Comment

by:supportlansmart
ID: 24816645
Same issue with a new user with a mailbox residing on the t2 mail server.. Outlook Web Access is not available. If the problem continues, contact technical support for your organization and tell them the following: There is no Microsoft Exchange Client Access server that has the necessary configuration in the Active Directory site where the mailbox is stored.

BTW, SSL is enabled on both OWA Virtual Directories.
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Accepted Solution

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Npatang earned 200 total points
ID: 24816669
Please kmake sure that we same Rolup on the CAS servers or else proxying will fail
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Author Comment

by:supportlansmart
ID: 24817411
Two things: On t2, get-OWAVirtualDirectory was coming up blank. Set the OWA Virtual Directory, andtried to log on, and sure enough, Roll-up levels were not the same. Applied the rollup on t1, and I'm golden. Thanks for your help!!
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Expert Comment

by:Npatang
ID: 24817427
Great ... Best of luck for furture
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