For the firewall prob:
Make sure your McAfee config is still ok & also double check that XP firewall is off.
How do you have your router set up (UPnP enabled, port forwarded or nothing)? I'm not sure if your router supports UPnP...if it does, you could try enabling it within the router, then choose that option within LW's tools > options > advanced > firewall config.
Or you could try port forwarding. See the link below
http://www.portforward.com/english/r...4/Limewire.htm

Connection:
Number 10's a bit of a worry...if you can't connect to that page it means the default Gnutella port's blocked. Was there a time when LW used to connect?
I don't want to be a pessimist but it could be your ISP at fault, have a look at the last post by Aaron below
http://www.gnutellaforums.com/showthread.php?p=202379

You could try changing ports, change LW's listening port (on the firewall config page) to something like 64049. You'll also have to change port numbers forwarded to that same number. If your ISP are blocking, changing ports may not help at all...but it's not going to hurt to try.

Check the sticky below for more connection/firewall advice
Connection problems? Check here first!