Wired access working, wireless not

I setup my connection from my laptop WinXP SP2 (up to date on WU) using my
wired connection to the server.
Now I've moved to wireless I can view the network, connect to the SBS
intranet but I can't view pages from the internet.
I've gone into the firewall for the network connection and allowed FTP, and
the two internet connections but still get no sites displayed.
I assume it's a firewall thing but in keeping with recommended policy I'm
relunctant to turn everything in the firewall off.
Or could it be something else in IE6 ?

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Regards

Mike