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?
tstarlinAsked:
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LeeDerbyshireCommented:
What do the IIS log entries look like (there should be a large block of them created each time you try to use OWA)?
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tstarlinAuthor Commented:
Attached is an OWA entery in the IIS logs from yesterday. They all look the same.

IIS-OWA.txt
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LeeDerbyshireCommented:
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

EXCEPT

all those 14.1.xxx.x directories (although you only really care about the latest, highest-numbered one).
auth
bin

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 14.1.xxx.x 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.
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tstarlinAuthor Commented:
Sorry, I took so long to close this. Thanks so much LeeDerbyshire, you were spot on.
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ITnavigatorsCommented:
Many thanks.  Spent way too much time troubleshooting this one.  You nailed it.
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