Office - SharePoint and Office Web Apps

Scope

Clients unable to open Office Web Apps from SharePoint where ESP is enabled.

It's possible ESP is blocking a connection sourcing from the Office Web Apps Server, where it needs to initiate a verification connection to your SharePoint server using a GET request something similar to this URL

"https://sharepoint.kemptest.com/connect/IE/compliance/commercial/_vti_bin/wopi.ashx/files/c075547437214edeb69859c15a9c."  This connection shouldn't be authenticated.

Solution

Add string  */_vti_bin/wopi.ashx/*  to your ESP "Pre-Authorization Excluded Directories"

Configuration

Navigate to your Virtual Service > Modify > ESP > Pre-Authorization Excluded Directories, and add

*/_vti_bin/wopi.ashx/*

 

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