ETS6 connection error

Hello,

i cant seem to get a good connection between ets6 and the jigsaw pro. Sometimes it works, but most of the times when ik try to add a connection using iptunneling and entering the jigsaws IP. It says it can ping the device but could get an identification. When i test the connection, it fails. So i can't program ....

if i browse to the ip adres, i can access the jigsaw, so connection is fine