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CWL 1 Reputation point
2022-04-20T18:04:38.913+00:00

I've run into this issue and searched the fourms, I've seen previous threads and have a workaround but don't know the root cause. I've checked the server for open files but nothing open, checked permissions all looks good. User can save file locally then copy to fileserver but not quite a solution.

Only change we have implemented latley was SMB signing.
GPO --> Computer Configuration --> Policies --> Windows Settings --> Security Settings --> Local Policies/Security Options --> Micosoft network clinet: Digitally sign communications (always) & (if server agrees) ENABLED as well as Microsoft network server: Digitally sign communications (always) ENABLED

Tried:
Rolled back GPO
I've disabled SMBv1 on both client and file server.
Disabled all Antivirus

Workaround:
[HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Word\Options]
"DisableRobustifiedUNC"=dword:00000001
[HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Excel\Options]
"DisableRobustifiedUNC"=dword:00000001
[HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\PowerPoint\Options]
"DisableRobustifiedUNC"=dword:00000001

It doesn't happen to everyone, at least for now. I need to figure out the root cause. I don't want to have to deploy the workaround everywhere if I don't have to, even if I do surely something is wrong and rather fix the root cause before it effects other aspects of Windows.

Windows 10 Network
Windows 10 Network
Windows 10: A Microsoft operating system that runs on personal computers and tablets.Network: A group of devices that communicate either wirelessly or via a physical connection.
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  1. CWL 1 Reputation point
    2022-04-21T12:11:15.597+00:00

    NM, it was our EDR client Comodo

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  2. Limitless Technology 39,341 Reputation points
    2022-04-25T08:57:13.677+00:00

    Hi there,

    Unfortunately, the root cause for this issue has not been yet determined. As you have said there are many forums and threads that discuss the issue and most of the time the workaround has sorted this.

    If you need the root cause I would suggest you check the event viewer for traces and also use the process monitor. Process Monitor is an advanced monitoring tool for Windows that shows real-time file system, Registry, and process/thread activity.

    You can get the tool from here https://learn.microsoft.com/en-us/sysinternals/downloads/procmon

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