Default ports in NetworkConfigurator and registration at the IANA
From the NetworkConfigurator documentation: "(...) it defines an edge configuration with TCP in auto mode w/port range 9701-9799, multicast enabled on group "220.127.116.11", and port 1234, HTTP transport with only outgoing enabled."
Yet, some of the 9701-9799 ports are already registered for specific application at the IANA (http://www.iana.org/assignments/port-numbers). Port 1234 is reserved for Infoseek Search Agent (which does not exists anymore but...).
Shouldn't JXTA register its own ports to create an official context facilitating their opening on NAT/Firewalls rather than sneaking unofficial ones? The procedure is described in section 19.9 of the following document: http://www.rfc-editor.org/rfc/rfc4340.txt.