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Windows Sandbox hangs at splash screen

ErikR 96 Reputation points
2020-12-19T18:59:49.643+00:00

When I start Windows Sandbox it hangs at the splash screen.

  • There is around 12% CPU usage from cmproxyd.exe
  • Every minute the following error event 7011 is logged in the Windows System event log: A timeout (30000 milliseconds) was reached while waiting for a transaction response from the CmService service.
  • Waiting doesn't help (30 minutes now, and counting...)

Anybody knows how to fix this, or how to troubleshoot Windows Sandbox to see what's going on?

Details:

  • Windows 10 20H2 (Enterprise).
  • Windows Sandbox did work previously on the same computer, with Windows 10 1909. It didn't work with 2004 either.
  • Removing and re-enabling the Windows Sandbox features doesn't help.
  • Running as Administrator or not makes no difference,
  • List item
  • Hyper-V VMs works fine on the same computer.
  • McAfee Endpoint Security 10.7.0 with the Nov 2020 update. This is under enterprise control so I can't disable it or make changes, but it kind of is my main suspect...

Thanks!

// Erik

Windows for business | Windows Client for IT Pros | Storage high availability | Virtualization and Hyper-V
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Accepted answer
  1. ErikR 96 Reputation points
    2020-12-22T13:22:59.66+00:00

    After the other replies to my Q, I continued the path of blaming McAfee :). So I got help from the antivirus-admin of my organization, and was able to solve the issue:

    First we tried disabling McAfee Endpoint Security, but it made no difference, so then we completely uninstalled it. And then Sandbox worked fine again.

    But also: after re-installing McAfee Endpoint Security again, Windows Sandbox STILL worked.

    So my best guess is that something wasn't quite right with McAfee which got fixed after the uninstall and reinstallation.

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  1. Michal Barták 231 Reputation points
    2020-12-20T23:23:29.097+00:00

    Really hard to debug this when you are unable to temporarily get rid of one of the most hated antivirus solution in the whole universe :) cant you uninstall it when you are a local admin?

    In my experience whenever there was a Windows version upgrade, some application broke because of AV (Trend micro in my case)

    1 person found this answer helpful.
  2. Carl Fan 6,881 Reputation points
    2020-12-21T10:05:33.16+00:00

    Hi,
    what's your system version and OS build?
    Type "winver" in Search Bar to check.
    Have you tried to update to latest Win10 20H2 to check? Also I consider it is necessary to do a clean boot and temporarily disable the security software to check.
    Hope this helps and please help to accept as Answer if the response is useful.
    Best Regards,
    Carl

    1 person found this answer helpful.
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