Microsoft says the upgrade block has also been lifted

Jan 8, 2021 17:56 GMT  ·  By

Microsoft has revealed this week that a bug causing Windows 10 version 20H2 to receive an unexpected restart message when opening dialog windows listing users is now fixed.

In addition, the company says the upgrade block preventing devices potentially affected by the problem has also been lifted, so these computers can now upgrade to Windows 10 version 20H2 through the typical official channels.

“After updating to Windows 10, version 20H2, you might receive the error in LSASS.exe with the text "Your PC will automatically restart in one minute" when interacting with any dialog window that lists users, for example accessing the sign-in options settings app page or the users folder in the Local user and groups MMC snap-in. This issue only affects devices in which any of the local built-in accounts have been renamed, such as Administrator or Guest. You might also receive an error in the Application Event log with Event ID 1015 that LSASS.EXE failed with status code C0000374. C0000374 is related to heap corruption,” Microsoft originally explained.

Windows Server version 20H2 affected too

The company says the problem affected both Windows 10 version 20H2 and Windows Server 20H2, and it could take up to 24 hours until the safeguard hold is removed from all devices and the update is therefore allowed.

As for what was causing the issue, the company says it all comes down to duplicated user accounts created during the update process to Windows 10 version 20H2.

“This issue is caused by duplicate built-in user accounts being created with the same security identifiers (SIDs) and relative identifiers (RIDs) during the update to Windows 10, version 20H2. SIDs and RIDs for built-in user accounts are well-known as documented here and must be unique on a given device,” the company says.

If you’re using Windows Update for Business, the latest version packing the fix should already be available.