What is your ISP.
Also, how long have you waited with LW open? Sometimes, when it is trying to connect, LW will say that there is a firewall but will then proceed with connecting regularly

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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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