Why can't my L2TP VPN connection connect from Windows to ATP/USG/NSG?
Zyxel_Chris
Posts: 705 
Zyxel Employee
Zyxel Employee
in VPN
Sometimes, due to Microsoft patches, even with the same VPN settings, connections may not be established. Please try the settings as shown in the following figure. If it still doesn't work, please uncheck "Microsoft CHAP Version 2" and check "Unencrypted password" instead.
The second thing you can check is to ensure that IKE has been activated in Windows services.
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