This week we saw how Microsoft launched the first Patch Tuesday of 2022. Corresponding to the month of January, this is an update that arrives associated with patch KB5009566 with build 22000.434. An update that causes user complaints by offering problems when connecting to a VPN.

KB5009543 patch has arrived for different versions of Windows 10 such as 2004, 20H1 and 21H1. Two days after its launch, users are complaining about issues while connecting to different VPN clients via L2TP protocol.

Another Microsoft account error

Microsoft has released different Windows 10 updates to fix security vulnerabilities and bugs and as usual the newly released patch has bugs and caused user complaints.

After installing the patch, users complain that they cannot establish L2TP VPN connections when trying to connect using the Windows VPN client. A failure that causes the following error message on the screen.

“Unable to connect to VPN. The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer”

This bug mainly affects the built-in Windows VPN client and Microsoft is already aware of it and confirms the existence of the error on the support site.

“After installing KB5009543, IP Security (IPSEC) connections that contain a Provider ID might fail. VPN connections using Layer 2 Tunneling Protocol (L2TP) or IP Security Internet Key Exchange (IPSEC IKE) might also fail. affected.

Microsoft states that the error can be mitigated by disabling “provider identification”, if possible, on the VPN server.

“To mitigate the issue for some VPNs, you can disable Provider ID in server-side settings. Note: Not all VPN servers have the option to disable the use of Provider ID.”

For now, the most effective solution they offer is the most radical one, which consists of uninstalling the update with the KB5009543 patch from the “Control Panel” then in “Programs” and “View updates”. day installed”.

Of course, keep in mind that removing the update will remove all patches and fixes released to cover vulnerabilities.

Through | BeepComputer
More information | microsoft