I had a similar situation. It turned out that the laptop had a cell data card in it and the when both the cell card and Wifi were enabled it would not connect. I turned off the cell card and everything worked fine after that.
Ok I downloaded 6.0.5 version for the user and the user can now connect, problem solved! Strange.....
Is there a legit way for user to download these older versions, other than through the fortigate support site for which you need a fortigate login?
Other thing now is that i have another user is now also trying this 6.0.5 version, but strangely it does not save connection settings after clicking "Configure VPN", hence user cannot connect. Any ideas?
Ok so last user which had the same problem as the other, which was saving the connections in 6.0.x is also resolved. It would always bounce back to "Configure VPN" with empty screen.
Turns out that you really do have to follow the advice after uninstalling to reboot the system, and then install and reboot again when it prompts. A pain but still, i had two users who resolved this issue simply by doing a reboot.
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