Following your guide exactly. »L2TP VPN on USG - quick how-to
Double checked all settings. Even saw your later post about being careful with 3DES/AES128 with Win 7 native client. Can't get a connection. Keep getting Win 7 native error 789: The L2TP connection attempt failed because the security layer encountered a processing error during the initial negotiation with the remote computer.
I have also double checked the Windows client settings and I do have L2TP set and the preshared key set. Still getting same error. And, yes I am testing connection from over WAN, not on LAN.
What am I doing wrong? Really thinking I should blow this off and stick with Greenbow VPN and straight IPSec. L2TP is a royal pain in the backside to make work! Zyxel is not helping the situation.
One thing I was thinking is whats the point of creating the L2TP object at the very beginning of your first post, if you are not using that Object in the Service Group or anywhere else? Am I missing something?