Recently released updates for Windows 10 and 11 cause VPN problems. Here’s what you can do about it.
VPN problems on Windows 10/11 after Microsoft update
© Alexander Supertramp / Shutterstock.com Complaints from Windows 10 and Windows 11 users about problems with L2TP VPN connections are increasing, as reported by the IT security site Bleepingcomputer, among others. The two cumulative updates KB5009543 (for Windows 10) and KB5009566 (for Windows 11), which Microsoft released on the first patch day of 2022 in January, are said to be to blame. Top deal: Windows 11 Pro for 70 euros in the PC WORLD shop
These cumulative updates contain various bug fixes and improvements, including a component that caused L2TP VPN connections to fail for some users. The users get the error message that a VPN connection is not possible. Windows shows error code 789 in the event log. Apparently only the VPN client integrated in Windows 10 or Windows 11 is affected. According to user reports on Reddit, the connection problems do not occur via other VPN clients. Microsoft has now confirmed the error. In the Microsoft Health Dashboard there is an entry that the error is currently being updated and should be fixed with a future update. Microsoft recommends here: “To work around the problem with some VPNs, you can disable Vendor ID in the server-side settings. Note: Not all VPN servers have the option to disable the use of Vendor ID.”
How to solve the problem yourself
Alternatively, the updates can also be uninstalled in Windows 10 or Windows 11. However, this also entails a certain risk, because this also removes all other components of the cumulative updates from the system and Windows is no longer so well protected against known, existing security gaps. If you still want to take the risk, you can uninstall the cumulative updates. Method 1: Windows update settings Use Windows search to search for “view update history” and then type enter. In the “View update history” window, click on “Uninstall updates” and then right-click on KB5009543 or KB5009566 and select “Uninstall” from the context menu.
Method 2: command line
To do this, the command line editor must be called up with administrator rights and then one of the following commands must be entered: Under Windows 10: wusa /uninstall /kb:5009543 Under Windows 11: wusa /uninstall /kb:5009566
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