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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?
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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.
![](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(28.799999999999997, 91%, 12%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJ%3C/text%3E%3C/svg%3E)
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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Not yet install KB5072033 and already not working.
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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.
![](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(256, 21%, 34%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EM%3C/text%3E%3C/svg%3E)
See the issue also reported here:
https://github.com/microsoft/Windows-Sandbox/issues/101
![](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(233.6, 15%, 32%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EB%3C/text%3E%3C/svg%3E)
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.
![](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(166.4, 53%, 26%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EC%3C/text%3E%3C/svg%3E)
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.
It appears that Microsoft have finally fixed the issue in update "2026-01 Preview Update (KB5074105) (26200.7705)" where we find following info in the release notes:
"[Windows Sandbox] Fixed: This update addresses an issue that could cause Windows Sandbox to stop responding during start up and display error 0x800705b4."
I have just tested it, and my Sandbox starts again, using default settings.
Crossing fingers it will last!
yes with the last updates the sandbox start work again Great
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Danke an Microsoft. Warum nicht gleich so!!!
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After multiple attempts to uninstall, reinstall, repair, and reset Windows Sandbox and other system components on Windows 11 (Build 10.0.26200 / 25H2)—including repairing the OS itself and uninstalling/reinstalling several Windows updates—I was finally able to pinpoint the root cause.
In my case, the issue was graphics driver–related.
Initially, I updated my discrete GPU drivers, but that alone did not resolve the problem. I was running an AMD Radeon card, and even with the latest drivers installed, Windows Sandbox continued to fail with the Reconnect issue. I rolled back all AMD drivers, ran the AMD Cleanup Utility, and saw temporary improvement, but the problem eventually returned.
What ultimately resolved it was disabling the onboard graphics adapter. After disabling the Intel UHD Graphics 770 driver in Device Manager, Windows Sandbox began launching normally and consistently. I then reinstalled the latest AMD drivers—specifically the OEM drivers from the Dell support site, not the AMD Adrenaline Suite—and the system has remained stable since.
TL;DR: Before repairing or resetting Windows Sandbox or other system components, try disabling the onboard graphics adapter in Device Manager. This alone resolved the issue for me without requiring further OS-level repairs.
