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i have deleted my double answer
Windows Sandbox fails to open with 0x800705B4
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(108.80000000000001, 79%, 20%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMH%3C/text%3E%3C/svg%3E)
Michael Higham
265
Reputation points
I'm having a problem running Windows Sandbox on my Windows 11 PC.
When I start Windows Sandbox, it stalls at the logo for ten minutes or so, and then an error message shows up:
Restarting the PC and uninstalling and reinstalling Windows Sandbox don't correct the problem.
Anybody else experiencing this problem?
Windows for home | Windows 11 | Apps
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David Elliott 30 Reputation points2025-12-12T11:37:46.44+00:00 Same here with Windows Sandbox not starting with (0.800705B4).
Windows Sandbox is turned on in "turn Windows features on & off."
Sandbox opened and worked normally previously but I am unsure if I tested this after update KB5070311. But it definitly does not work after KB5072033.
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JM 65 Reputation points2025-12-12T15:36:55.9266667+00:00 I have the exact same issue, and going to Windows Store just says Windows Sandbox is installed (there is no update pending for it)
Win 11 Build 26100.7462
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daniel grandjean 0 Reputation points2025-12-15T10:32:37.82+00:00 Not yet install KB5072033 and already not working.
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Krzysztof Huryn 30 Reputation points2025-12-19T09:31:58.7133333+00:00 Exactly the same issue here, since a week or so ago.
Windows 11 Pro 25H2 (OS Build 2600.7462).
Tried all the obvious steps including removing/re-adding the Sandbox feature.
Tried starting Sandbox with both standard settings and using my own .wsb with the <vGPU>Disable</vGPU> added. None of the methods work.
When activating Sandox, generation of the temp files in c:\ProgramData\Microsoft\Windows\Containers\ContainerStorages\ takes some minutes while the folder grows to just below 2 GB, then the (0x800705B4) error appears. -
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micTronic 0 Reputation points2025-12-29T11:52:56.12+00:00 See the issue also reported here:
https://github.com/microsoft/Windows-Sandbox/issues/101 -
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Bijan 0 Reputation points2026-02-11T07:54:58.2966667+00:00 I noticed this problem in January. Tried updating to build 26200.7628 and reinstalling the sandbox. However, the issue still persists with a few minutes of loading—then the sandbox crashes with 0x800705B4.
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CharlyArg 0 Reputation points2026-05-10T20:04:56.6166667+00:00 Chiming in here as I have 22600.8246 and still having issues to start Sandbox in Windows 11. Oddly enough I found out that if I start it just as soon as I login, it will work; thus: application. In my case it was Moto's Smart Connect application (it connects to your smartphone). But worth it to check the ones open.
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29 answers
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WILSON JIACOMINI 25 Reputation points2026-01-07T15:55:08.39+00:00 It's unbelievable how Microsoft is ignoring (the shitting) this problem, which affects me and countless other users.
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rhadamantys 70 Reputation points2026-01-13T11:56:34.6166667+00:00 Here https://github.com/microsoft/Windows-Sandbox/issues/101
Some more user experience the same bug and some have use debug and procmon program to traied to explained the problem and causes.
I hope Micrososft view the sandbox github, but appear its dead...
I hope Microsoft create a fix o a update or something to reapir this bug
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Christophe Sperandio 5 Reputation points2026-01-13T12:47:42.8433333+00:00 Yes! I'm the one having done the procmon analysis and posted on GitHub. I'm also feeding z reddit thread and opened a detailed feedback in the feedback hub... Hope we will get some visibility at some point!
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rhadamantys 70 Reputation points
2026-01-13T20:17:11.0533333+00:00 Windows 11 pro jan 2016 update installed, the bug still here....
Win11 25h2 26200.7623
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SaturnLive 30 Reputation points2026-01-14T10:44:28.2833333+00:00 Windows 11 25H2 26200.7623, still getting the error: Failed to initialize Windows Sandbox. Timeout. The operation failed. (0x800705B4).
Windows Sandbox hasn't been working for over a month, I even did an in-place upgrade and disabled and re-enabled Windows features several times but it doesn't work!!!