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I am trying to set up a L2TP/IPSec server on AWS with instance running Ubuntu 14.04LTS. I followed the instructions that I found here : https://raymii.org/s/tags/vpn.html.

I tried to use 12.04LTS and 14.04LTS to install the VPN server but both gave me the Error 789 on Windows clients.

Error: 789 "The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer"

Can anyone give me some idea or suggestion what can I do to fix this ? Is there any better application I should install except from Openswan ? Thanks.

CK Tan
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For Windows users, a registry change is required to be able to connect to an IPsec/L2TP VPN behind NAT (e.g. in EC2). Please follow these instructions. Scroll down to the bottom to view separate steps for Windows XP, and for Vista, 7, and Server 2008.

CK Tan
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