As long as it says false then it's (most probably) XP's firewall behind the problem (I guess you must already know that though...). Have you tried disabling every firewall-like thingy to see if you can connect or not (in case it's not the firewalls, but I doubt it).

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

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