VPN L2TP not working since last update

Guillaume06140

Hi,
On a USG20-VPN, I set up a VPN-L2TP working perfectly fine for several users.
Since several weeks (it seems to be since last update) no one is able to connect on the VPN getting this error on Windows (sorry in French):


On the USG20-VPN, I see only logs with IKE filter:

Thanks for your help...

Mintausch

Due to the last Microsoft update, remove it and restart your desktop
kb:5009543 for Windows 10
kb:5009566 for Windows 11
Merci Microsoft (très agréable pendant que actuellement PERSONNE n'utilise les connexion VPN)

Remo

I think it's fixed already. Installing the latest Windows Updates worked for us.

Zyxel_Tobias

Hi! @Guillaume06140

https://support.zyxel.eu/hc/en-us/articles/4415084375954-Announcement-Windows-VPN-client-RAS-client-issue-after-installation-of-Windows-Update-from-January-11th-2022-KB5009543-KB5009566-

Thanks!

Tobias