In general: A packet capture could help to clarify what causes the problem. tcpdump can be used on the Nokia device (Wireshark/Ethereal could be used from another host. See http://maemo.org/development/documen...s/tcpdump.html for more info.

Also see https://bugs.maemo.org/show_bug.cgi?id=1017 and https://bugs.maemo.org/show_bug.cgi?id=417 for current wifi restrictions.