Operation fails when you try to save an Office file through Web Application Proxy in Windows Server 2012 R2

Applies to: Windows Server 2012 R2 DatacenterWindows Server 2012 R2 EssentialsWindows Server 2012 R2 Foundation


Consider the following scenario:
  • You publish a SharePoint site through the Web Application Proxy role service on a server that's running Windows Server 2012 R2.
  • On a client computer, you open SharePoint and then log on through Web Application Proxy.
  • You open an Office document and make some changes.

When you try to save the Office document in this scenario, the save operation fails. Additionally, you receive an indication that there was an error accessing or uploading to the disk.


This issue occurs when the edge access token has expired. When the client presents the edge access cookie together with the expired token, the error occurs when Office Forms Based Authentication Protocol (MS-OFBA) headers are used.


Hotfix information

A supported hotfix is available from Microsoft Support. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, go to the following Microsoft website: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


To apply this update, you must first have update 2919355 installed in Windows Server 2012 R2.

Restart requirement

You may have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any previously released hotfix.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

Related Office fixes

We recommend that you also install the following related Office updates. These updates address some issues in which the Office Sign-In button does not work as expected after the MS-OFBA token expires.

Important After you install these related Office updates, you must add the following value to the registry:

Registry subkey:HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Common\Internet
DWORD name: RefreshFormBasedAuthCookie
DWORD value: 00000001


Learn about the terminology that Microsoft uses to describe software updates.