Local streaming problem

LMS appears to be having difficulty with processing streams emanating from the same host.

If I specify the host name or the localhost address, streaming starts but there is no audio and the stream stops after 5-10seconds
e.g.
http://hda:3000/someaudiostreamingurl
http://127.0.0.1:3000/someaudiostreamingurl

However if I specify the IP address of the host, streaming works OK
e.g.
http://192.168.1.22:3000/someaudiostreamingurl

In all cases the debug log for the streaming source shows a successful connection.
Is this a problem with LMS or some other part of the operating system of the host?

LMS 7.7.3
Ubuntu server 12.10 64bit

Thanks