Exchange 2010 Update Rollup 5, OWA page is blank.

I recently installed Microsoft Exchange 2010's Update Rollup 5 (Windows Server 2008 R2 Enterprise OS) and since have had a blank page when connecting to our OWA. Both IE and Chrome show no error, just a completely blank page. IIS has been restarted as has the server itself. All permissions look correct. Also, I know webmail is functioning as our mobile devices connect to the Exchange server through the same web address and they're all pulling email without an issue. Any thoughts?
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What do the IIS log entries look like (there should be a large block of them created each time you try to use OWA)?
tstarlinAuthor Commented:
Attached is an OWA entery in the IIS logs from yesterday. They all look the same.

It looks like the anonymous user (which is what you are until you've succesfully logged on) no longer has access to the /owa/14.1.355.2/scripts/premium/flogon.js resource.

Have a look at the authentication settings in iis.  On the owa vdir itself, you should have only basic auth enabled, and I expect this has somehow propagated to the levels below.  In fact the 14.1.355.2 vdir should have only anonymous access enabled, and propagated to the vdirs below.  Here, I have:

owa - Basic Auth enabled, and propagated to all subdirectories


all those directories (although you only really care about the latest, highest-numbered one).

which all have anonymous access enabled, and propagated to all subdirectories.

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tstarlinAuthor Commented:
OWA only had Basic Auth enabled, and all the directories had Anonymous enabled except 14.1.355.2 which was set to Basic. I've changed it to Anonymous. I will check from home to see if that did it. Thank you for the advice.
tstarlinAuthor Commented:
Sorry, I took so long to close this. Thanks so much LeeDerbyshire, you were spot on.
Many thanks.  Spent way too much time troubleshooting this one.  You nailed it.
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