General discussion

Windows Sandbox

My Windows Sandbox it's not working. I have all things enable - Virtualization, Hypervisor and Sandbox on Panel Control, but when the Sandbox start (only a blue window with the sandbox logo) just stays there for a long time before crash. Crash error: Error 0x800706d9. There are no more endpoints available from the endpoint mapper.

Thank you in advance.

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This is a new and buggy feature.
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And If You're Running the New Version 1903, Known Issue
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Thanks for the link.

I only knew it was broke or unreliable.

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How to get Windows 10 1903 sandbox working again.

For Windows 10 1903 sandbox wont start errors all you do is just restart the following service under Administrative tools

Container Manager Services.

then reopen sandbox should start up like normal.

If it does not start up do the following below.

If you have Hyper-V installed and Virtual disk is turned on under Administrative tools you must restart all these services

1. Container Manager Services
2. HV Host
3. Virtual Disk
4. Hyper-V Virtual Machine Manager
5. Hyper-V Host Compute Service
6. Network Virtualization Service
• Do this in the following order
1. Right click over (Network Virtualization Service) click restart and wait.
2. Right click over (Virtual Disk) click restart and wait.
3. Right click over (Hyper-V Virtual Machine Manager) click restart and wait
4. Right click over (Hyper-V Host Compute Service) click restart and wait
5. Right click over (Container Manager Services) click restart and wait

Check these services are still on
Application Guard Container Service (If installed)
Remote Procedure Call (RDC) (""This must be running as most of the others rely upon its function it should never be disabled"")

Once they are checked start sandbox and it should open up if it does restart your computer to ensure the services are still functional are a restart of computer this should also be done if sandbox does not start up once these services are restarted and checked.

Created By Eric O'Malley
17th June 2019

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Another way around sandbox wont start issues.

The problem why sandbox wont start in Windows 10 is related to the way other interact with the other services and program i also have written guide for early issue with sandbox but found new way around the issue since then.

Windows Sandbox failed to start
A Work Around
To get
Windows Sandbox
Working again
Eric O’Malley

Well I work out a solution to get Windows Sandbox going again it’s not the best solution but work around follow the steps below and hope it works for all of you guys.

1. The first thing you have to do is turn off Windows Defender Random Folder Protection or the anti virus random folder protection.
2. Next turn off Windows defenders Tamper protection Or the Anti-Virus Tamper protection
3. Once that turn off Go to Control Panel open it
4. Location Administrative Tools
5. Next head to Services and open that
6. Scroll down to Container Manager Services
7. Turn off Container Manager Service only
8. Leave service screen open but minimize it
9. Next go to control panel location and open File Explorer Options
10. In File Explorer Options Untick the following:

• Don’t Show Hidden Files, Folders, or Drivers
• Hide Empty Drivers
• Hide Extensions Known Files Types
• Hide Merge Conflicts
• Hide Protected Operating Systems Files

11. Now move File Explorer Options to one side of your screen
12. Go back to Control Panel
13. Locate and open Program and Features
14. Go to Turn Windows Features on or Off open it
15. Scroll down to Windows Sandbox
16. Untick Windows Sandbox
17. Click ok to uninstall Windows Sandbox
18. Close off only the screen that removed Windows sandbox
19. Next go to your main drive usually C: Drive
20. Location ProgramData
• We need to get to this location (C:\programData\Microsoft\Windows\Containters\Sandboxes)

21. Even open it or expand ProgramData
22. Locate Microsoft open it or expand
23. Scroll down to Windows open it or expand
24. Now go to the folder called Containers open it or expand
25. Now you should see Sandboxes
• You Should be at this location Now

26. Now in that folder Sandbox is folder that looks like this

• 4040f074-2ff6-471c-9f38-4836db85fff6
• Inside it is sandbox.vhdx

27. What we need do is delete all the strange folders keys that’s in

28. If it does not delete just wait a few seconds and try again

Caution do not delete the folders from recycle bin yet

29. Next go to the folder below it called Zygotes


Repeat the steps you did at Sandboxes and delete the strange folder keys with its contents but do not delete what’s in recycle bin.

30. Repeat the step you did at Sandboxes and delete the strange folder key with its contents
31. If it does not delete just wait a few seconds and try again
32. Now move the open explorer screen to one side of the screen
33. Head back to control panel
34. Locate and open Program and Features
35. Go to Turn Windows Features on or Off open it
36. Scroll down to Windows Sandbox
37. This time re-tick Windows Sandbox and close and allow it to reinstall the sandbox
38. Close only the install screen
39. Go back to services and Restart Container Manager Service
40. Leave Services screen open move it to once side again.
41. We now head to Start then Settings
42. Scroll until you find Windows Sandbox click it twice.
43. Wait and see how the screen opens if it give you another error repeat this process
44. When you open Windows Sandbox it should hang for 5 to 10 minutes without any error message
45. What it’s doing is rebuilding its image then it opens back to what it was in default settings.
46. Once you have sandbox reopened and its got the icons load close it pressing the red X
47. Then reopen Windows Sandbox to see if it opens up again.
48. If it does you fixed it.
49. Now we can turn back on
• Windows Defender Random Folder Protection or the anti virus random folder protection

• Windows defenders Tamper protection Or the Anti-Virus Tamper protection

50. Retest Windows sandbox will open again with the above turned on
51. If it does the next thing is to restart your computer and Repeat the opening of Windows sandbox.
52. Once all is well your right to continue
53. You can delete the folders in your recycle bin too.

Created by
Eric O’Malley

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