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OWA 2007 through ISA 2006 fails with Server Error, 501

Posted on 2009-05-16
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Problem: OWA 2007 works fine internally(https://CAS/exchange or https://CAS/owa both work - exchange will redirect to owa), but fails with error Server Error, 501  Header values specify a method that is not implemented when trying to access it externally through our ISA 2006 server
We use an external SSL certificate.
Full Error Message:   501 - Header values specify a method that is not implemented.
The page you are looking for cannot be displayed because a header value in the request does not match certain configuration settings on the Web server. For example, a request header might specify a POST to a static file that cannot be posted to, or specify a Transfer-Encoding value that cannot make use of compression.
Setup:

We are coming from an exchange 2003 environment, starting to setup our first exchange 2007 servers.

Exchange 2007 servers, all running Server 2008 SP1, rollup 7:
EDGE
CAS/Hub Transport
MBX
The ISA server is running on server 2003, it is ISA 2006

If I try to access a mailbox that is on a 2003 server, it goes through fine, but if the mailbox is on the 2007 server, I get the error message.

http://support.microsoft.com/kb/942058 did not seem to have any effect on the problem.

In my OWA rule on the ISA server for paths, Im using /      /exchange\ 
in addition to the 4 default ones (external path says <same as internal>, paths are /public/*, /OWA/*, /Exchangeweb/*, /Exchange/*)

Forms based Authentication is turned off on the CAS server, its set to basic or integrated windows authentication.

Thoughts on what to check?
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Question by:darazman
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darazman earned 0 total points
ID: 24417590
Okay, so I found my problem.  I dont know if not having SP1 on ISA 2006 played a part in the problem or not, but it was service packed, that alone didnt solve my problem though.  installing the http redirect on the IIS 7 server of the CAS server and setting that up as per:

http://technet.microsoft.com/en-us/library/aa998359.aspx

seemed to do the trick.
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