I want to connect to my n900 through UMTS (or another phone data service)

It seems not to work. (Why?) Not even ping!

I was sure it would work. Because the Browser knows AJAX.

Shouldn't AJAX be able to do such things (connections)?

Is there an AJAX-program that can do that?

Or is there an "online-connector" that can connect to devices with UMTS under "https" security?