How to connect to a FortiGate IPSec-VPN using Linux

Update 2016-11-22

This article might not longer be relevant as a new opensource client called "openfortivpn" exists that utilized the SSLVPN feature of Fortigate instead of IPSec. See my new article Connecto to Fortigate VPN with OpenfortiVPN.


This article might be relevant to you if you have problems connecting to a FortiGate IPSec VPN with Linux (vpnc). For example, when using NetworkManager, you might see something like this in syslog:

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