L2TP VPN services are affected by the new Windows KB5009543 and KB5009566 patches

Retrieved from cnn.com

After applying the latest Windows 10 KB5009543 and Windows 11 KB5009566 comprehensive updates, users and administrators are reporting issues connecting to L2TP VPNs. As part of the January 2022 Patch Tuesday, Microsoft delivered Windows updates to address security bugs and issues. KB5009566 for Windows 11 and KB5009543 for Windows 10 2004, 20H1, and…