Receiving an error message when attempting to open Windows Defender Application Guard (WDAG) or Windows Sandbox

Applies to: Windows 10 Pro, version 1903Windows 10 Enterprise, version 1903Windows 10 Pro, version 1909

Symptom summary


Windows Defender Application Guard (WDAG) or Windows Sandbox might fail to open with the error, "ERROR_VSMB_SAVED_STATE_FILE_NOT_FOUND (0xC0370400)" or "E_PATHNOTFOUND (0x80070003)".

Workaround


To mitigate this issue after receiving one of the above error messages, you will need to restart your device.

Next Steps


Microsoft is working on a resolution and will provide an update in an upcoming release.