Make it simpler: go to Limewire->Preferences and click on the Bug Reports selection. There, click for an example and scroll down to the part where it says: Recieved incoming this session. If it says true then Limewire does not have a problem from Firewall. If it says false, Firewall(s) are blocking the connection.

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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-