I find "ping foobar" in Settings > Advanced. I tried to find out, why. In b2e demo there is no "ping foobar". So I thought may be I installed a plugin. But I can not find such a plugin nor a widget. I I have forgotten, what "ping foobar" is good for. Could anyone give me some advice?
Found it. It was in Generic Ping-Plugin (b2evGPing). I customized (obviously long ago ;-)
rpc.foobar.com:8080
for Ping Service Url. I deactivated that plugin. So you can close this thread, please.