This article has been updated on January 19, 2022. Windows VPN (L2TP over IPsec) connection broke after the January 2022 update, But a few days later Microsoft released an OOB update (Out of Band) to solve this problem. The L2TP VPN issues have been fixed with Windows 10 (KB5010793) and Windows 11 (KB5010795) updates.
Here is the list of the various patches for the affected versions of Windows.
- Windows 11, version 21H1: KB5010795
- Windows Server 2022: KB5010796
- Windows 10, version 21H2: KB5010793
- Windows 10, version 21H1: KB5010793
- Windows 10, version 20H2, Windows Server, version 20H2: KB5010793
- Windows 10, version 20H1, Windows Server, version 20H1: KB5010793
- Windows 10, version 1909, Windows Server, version 1909: KB5010792
- Windows 10, version 1607, Windows Server 2016: KB5010790
- Windows 10, version 1507: KB5010789
- Windows 7 SP1: KB5010798
- Windows Server 2008 SP2: KB5010799
What was the issue exactly? Here is the story before the above update.
The news is short and sad! Windows VPN (L2TP over IPsec) connection broke after the January 2022 update. The security update for Windows released on January 11, 2022, known as Patch Tuesdays, have very unpleasant collateral damage. All users who rely on VPN connections with L2TP over IPsec will no longer work after installing the updates in question.
After Microsoft released the security updates for Windows as of January 11, 2022, We noticed various customers reporting issues with the VPN connections using L2TP over IPsec.
This monthly update KB5009543 for Windows 10 20H2 – 21H2, fixed some security issues, But broke the VPN connections using L2TP over IPSEC.
This situation has happened for Windows 11 users too. As you know, it’s a few months that Microsoft has released the new Windows 11 and some customers are using this version of Windows. Our researches show that Update KB5009566 for Windows 11 is similar to the KB5009543 for Windows 10 20H2 – 21H2, and will break the L2TP over IPsec VPN connections.
In the last couple of days were working hard to find a fix, But as expected, the only option is to uninstall this update and wait for a fix.
Previously, We wrote an article and described how to uninstall Microsoft Windows 10 updates. It is almost the same way for uninstalling Microsoft Windows 11 Updates, too. You can read this article here.
However, and after the problem was known, Microsoft has already publicly acknowledged the problem that affects Windows 10. The software giant promised an update soon that will definitively solve this situation and solve the problem.
We suggest you wait for a few days before installing the monthly cumulative updates. This way we ensure that if there is a serious error.