Which OS are you running? Did you unselect IPv6 for the local and the VPN interface? Are you running a local firewall?

I would say the 3rd party company should support you. You can also try using a newer version (5.2) of the FortiClient. You can find it here: http://forticlient.com/

After that you have to do these changes:

If you see this you have to delete the fortissl Connection and go to Programs and Features, select FortiClient and click on repair.

Hey guys, i just spent some time to solve this problem. Here is my solution (no work-around): Internet Options-> Connections -> " fortissl" -> Settings -> Dial-Up Settings -> If there is more than one device just check the right one (ISDN PPPoP WAN A...