You might want to have alook here:
http://gnuticles.gnufu.net/dev-infos.html

Initial Handshake
First from a_guest_in_the_machine from gnutellaforums.com: The initial handshake goes like this (contradicting current specs):

you
GNUTELLA CONNECT/0.6\r\n
\r\n

ultrapeer
GNUTELLA/0.6 200 (...)\r\n
(optional server specifics)\r\n
\r\n

you
GNUTELLA/0.6 200\r\n
\r\n

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