If you've read around for the problems that can create SP 2 (at least as far as P2P are concerned) then you'd know that the Windows firewall is activated with the upgrade.
In other words check if you have aany firewall active that may be blocking LW.

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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

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-