It is reproducible on 2 PC that FortClient works fine after 'Fritz!Fernzugang' has been uninstalled. Connection attempt will start, my internet connection will be terminated (as usual during VPN tunnel creation), but here progress will stop, connection will not be completed.
(Serial Number FCT8001814485799, UID2: 2E47C1A8324C4E83AEA3FCD38678EB0D) will not finish VPN connection if a AVM 'Fritz!Fernzugang' is installed on PC. On my 2 WIN7 64Bit PC installed FortiClient 5.