https://media01.nerdia.net/uploads/vpn-problem-kb5009543.png 262 448 Stefan Helander https://media01.nerdia.net/uploads/nerdia-logo-340x156.png Stefan Helander2022-01-20 10:27:482022-01-20 10:27:50Microsoft January 11, 2022 update breaks L2TP VPN [solution]
Microsoft January 11, 2022 update breaks L2TP VPN [solution]
Microsoft update KB5009543 breaks L2TP VPN functionality causing error message “The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer“. Investigating the log shows error 789 for rasclient.
A temporary solution is to uninstall KB50009543. Run cmd as administrator and enter:
wusa /uninstall /kb:5009543
After reboot VPN will work again.
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