#UPDATE WINDOWS REMOTE DESKTOP CLIENT UPDATE#
However, as Microsoft bundles all security updates in a single Windows cumulative update, removing the update will remove all fixes for vulnerabilities patched during the January Patch Tuesday. Windows users can remove the KB5009566 and KB5009543 updates using the following commands from an Elevated Command Prompt. With many users still working remotely, admins have been forced to remove the KB5009566 and KB5009543 updates, which immediately fixes the L2TP VPN connections on reboot. Many Windows admins also report on Reddit that the bug also affects connections to SonicWall, Cisco Meraki, and WatchGuard Firewalls, with the latter's client also affected by the bug.
The bug is not affecting all VPN devices and seems only to be affecting users using the built-in Windows VPN client to make the connection.Ī security researcher known as Ronny on Twitter told BleepingComputer that the bug affects their Ubiquiti Client-to-Site VPN connections for those using the Windows VPN client.
Windows event log for failed L2TP VPN connection
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