OWA 2010 – “cannot open this document for viewing because of an unexpected error”

    PROBLEM DETAILS & SYMPTOMS   Unpredictably, intermittently, and frequently clients trying to open office documents (word, excel, powerpoint, etc) in the browser from the SharePoint 2010 farm using office web apps get an error in the browser instead of the document.  Sometimes the error includes a correlation ID and sometimes it doesn’t.  An…

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Don’t Even Bother Trying to Enforce FIPSAlgorithmPolicy on SharePoint 2010 Servers

    Summary   Trying to force SharePoint servers to use only FIPS 140-2 compliant algorithms is not an uncommon event. It’s admittedly tempting. But invariably it breaks something in SharePoint 2010. It can and will cause one or more big problems for the proper functioning of SharePoint 2010. The most notable one is clients…

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Office Web Apps Exception: “An item with the same key has already been added”

    Scenario and Symptom:   An Office Web Apps 2013 server is talking to a SharePoint 2013 server and the following shows up in the ULS log (C:\ProgramData\Microsoft\OfficeWebApps\Data\Logs\ULS) of the OWA/WAC server:   03/14/2014 10:19:20.90         w3wp.exe (0x1CDC)    0x2854 Office Web Apps         Office Web Apps common            agq6x  Exception        WAC Server FrontEnd unhandled exception [0] System.ArgumentException:…

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