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Our OWA stopped working 48 hours ago and we have been trying to trouble-shoot it since. There were no changes to the environment, no Windows Updates were run through. The environment has been running without error for the past 9 months.
All of sudden our OWA has stopped working.
Our users come to the login page and once they log in, they get the error
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We are running 2 * Exchange 2013 Servers CU2 Build 712.24 and one Exchange 2010 (Build 123.4) for Edge Transport purposes. We have rebuilt the Virtual Directories, removed the Canary AD entries, just about everything we have been able to ascertain from the web, none of which has worked for us.
What's further puzzling is we are able to access the ECP/ EAC without error (and it logs through the OWA.auth).
Any help or insight would be much appreciated.
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We have re-created the OWA Virtual Directories a number of times (along with the ECP ones).
Running an CU 3 now to see if that assists...






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About Exchange 2013, can we assume SP1 installed?
As for SP1 no the environment has not been upgraded as yet.
When opening the OWA on Firefox, it gets to the point of "Opening your mailbox...." before the message appears... So perhaps it's an AD connectivity issue... We cant be sure.

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:-(
something went wrong
Sorry, we can't get that information right now. Please try again later. If the problem continues, contact your helpdesk.
X-OWA-Error: SDServerErr;System.Xml.XmlException
X-OWA-Version: 15.0.775.32
X-FEServer: <<SERVER NAME>>
X-BEServer: <<SERVER FQDN>>
Date: 1/2/1601 3:00:12 PM
less detail...
All Test Connectivity components come up OK (EWS, RPC, ActiveSync etc).
We have also switched the OWA from premium to lite and now able to access OWA.
Seems the same issue as this post...
http://social.technet.microsoft.com/Forums/exchange/en-US/bdc969e1-e0bc-4413-8a9a-ca61f4d5e7b1/owa-premium-not-working-only-light?forum=exchangesvradmin
@Adam - The AD Attributes look OK to me.






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Response "An unexpected error and was unable to handle the request."
X-OWA-Error: SDServerErr;System.Xml.Xml
Cache-Control: no-cache, no-store
Content-Type: application/x-javascript; charset=utf-8
Date: Mon, 25 Jul 2016 06:01:06 GMT
Expires: -1
Pragma: no-cache
Server: Microsoft-IIS/8.5
Set-Cookie: X-BackEndCookie=S-1-5-21-1
Transfer-Encoding: chunked
X-AspNet-Version: 4.0.30319
X-BEServer: EX02
X-BackEnd-Begin: 2016-07-25T09:01:07.129
X-BackEnd-End: 2016-07-25T09:01:07.223
X-CalculatedBETarget: ex02.corp.com
X-DiagInfo: EX02
X-FEServer: EX01
X-FrontEnd-Begin: 2016-07-25T09:01:06.824
X-FrontEnd-End: 2016-07-25T09:01:06.933
X-FrontEnd-Handler-Begin: 2016-07-25T09:01:06.824
X-OWA-CorrelationId: 20364d4f-7b76-4af8-ad09-4d
X-OWA-Error: System.Xml.XmlException
X-OWA-MinimumSupportedOWSV
X-OWA-OWSVersion: V2_23
X-OWA-Version: 15.0.1210.3
X-OWAErrorMessageID: ErrorUnexpectedFailure
X-Powered-By: ASP.NET
X-UA-Compatible: IE=EmulateIE7
request-id: 94559ce370-e12c-4269-be01-
x-content-type-options: nosniff
https://social.msdn.microsoft.com/Forums/en-US/2a78611e-f5e6-4867-b823-12d987a81816/owa-error-exchange-2013-cu13-sdservererr-systemxmlxmlexception?forum=exchangesvrdevelopment

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Exchange
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Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.