In Icecast, you must specify mount point. In case of listen2myradio its /stream. So full path is http://<ip address>:<port>/stream
And check if youre radio is on. They usually turn it off if youre not streaming for like an hour.
foobar works great, just if youre using listen2myradio, you have to choose Icecast instead of Shoutcast. Because only working caster (Vorbis stream) is casting music in Vorbis ogg and listen2myradio Shoutcast only supports mp3.