Hi Markus,
Ping button is available since 7.02 SP8 if I remember correctly. I can't tell from the screenshot, if it's older or not.
Without the ping, simply test the service from SE80. It's slightly bit more steps to do, but you can check, if the connection works or not.
See wiki page for steps: http://wiki.scn.sap.com/wiki/x/9AF7DQ#HowtoconfigureaServiceConsumer-QuickTesting
Cheers,
Attila