"To start seeing preview, please log on by opening the document"

ISSUE: Document preview for SharePoint 2013 search results randomly give an error "To start seeing previews, please log on by opening the document". CAUSE: The behavior occurs because the page that we use to show the preview (_layouts/15/wopiframe.aspx) is set up for anonymous access.  Since the user did not browse the site collections from where the documents to…

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SharePoint Search and Excel Interactive Preview: "404 – File or directory not found."

For the past several months I have worked on an issue with the Excel Interactive Preview throwing the error: "Server Error404 – File or directory not found.The resource you are looking for might have been removed,had its name changed, or is temporarily unavailable." When refining a SharePoint Search: We have determined the root cause and this…

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Office Web App 2010 Viewers do not work, System.ServiceModel.EndpointNotFoundException, when Nintex is running

Overview: You have Office Web Apps 2010 installed, Word and PowerPoint viewing does not work, but the editing does. The appserverhost.exe process is crashing on startup, with error: System.ServiceModel.EndpointNotFoundException  "There was no endpoint listening at net.pipe://127.0.0.1/e31bfd4c-5d98-4dc3-8232-5d2601ca814d that could accept the message. This is often caused by an incorrect address or SOAP action…."   Cause: The SharePoint…

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