https://reddit.com/r/sysadmin/comments/1wcextt/solved_kb5124008_windows_11_logon_error_on_screen/: [SOLVED] KB5124008 + Windows 11: Logon Error on Screen Unlock + Broken Secure Channel over VPN

Q: Which systems are reported to be affected?

The report identifies Windows 11 24H2 domain-joined notebooks after KB5124008, affecting both LAN-connected and remote users. VPN users are described as particularly critical because secure-channel repair over VPN fails.

Q: How can administrators confirm the reported condition?

The affected systems show a failed Test-ComputerSecureChannel result. Attempting to repair the secure channel over VPN returns an error stating that the secure-channel password could not be reset because the username or password is incorrect.

Q: Is there a temporary way to restore access?

Rebooting is reported to restore sign-in temporarily, but the unlock failure recurs after roughly one to two hours. Password resets are reported not to resolve the issue.

Published Sep 10, 2026

Updated

Affected Software

1 affected component

Microsoft Windows 11>=26100.9445<=26200.9445

Frequently Asked Questions

Which systems are reported to be affected?

The report identifies Windows 11 24H2 domain-joined notebooks after KB5124008, affecting both LAN-connected and remote users. VPN users are described as particularly critical because secure-channel repair over VPN fails.

How can administrators confirm the reported condition?

The affected systems show a failed Test-ComputerSecureChannel result. Attempting to repair the secure channel over VPN returns an error stating that the secure-channel password could not be reset because the username or password is incorrect.

Is there a temporary way to restore access?

Rebooting is reported to restore sign-in temporarily, but the unlock failure recurs after roughly one to two hours. Password resets are reported not to resolve the issue.