Julius writes that after uninstalling the January security update, VPN connection establishment works fine again. For me, the problem occurs on all devices that received KB5009566 and also under different architectures (amd64 and arm64). In particular, VPN connections to Cisco Meraki MX appliances are affected.
"The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer". The connection fails with the error message KB5009566 (Windows 11 22000.434) seems to cause some VPN connections (L2TP/pre-shared key/PAP) to stop working with the VPN client built into Windows 11. Got the first comment on the topic from German blog reader Julius, who describes the problem in connection with cumulative update KB5009566 for Windows 11 as follows (I've translated the German text): After Microsoft released the security updates for Windows as of January 11, 2022, I noticed various posts and comments as of Janureporting issues with VPN connections using L2TP over IPSEC.
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