Solved co-authoring failure for Office 2016 users causing locked documents

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Problem:
Users keep getting locked out of a document.
A user is able to make changes, but then everyone else isn't.

Among the errors:

"We're having trouble connecting to the server. If this keeps happening, contact your help desk."



"Upload failed. This file is locked for editing by ..."


Fiddler displays a 404 cobalt error:




Solution:

Apparently, there is a key in the registry that if non-existent, will prevent co-authoring!

There is a hotfix, the October 13, 2015, update for Office 2016 (KB2920679).

Or simply add the following registry key, and then restart Word:

Windows Registry Editor Version 5.00

 [HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\FileIO]
"EnableRealtimeChannel"=dword:00000000

(this could be saved as a .reg and executed)

Source:

https://support.microsoft.com/en-us/help/3100925/word-2016-co-authoring-fails-when-file-is-stored-on-sharepoint-2013

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