Some mac users feel the same about pc's. lol It's what you're used to I guess. This issue is not due to the mac anyway AFAIK. Unless you have the mac firewall active. See http://www.limewire.com/english/content/firewalls.shtml

As I said I'm out of ideas. I've sent a pm to Stief but it could be a day or so before he responds. If you're willing to try a proxy then see A Fix for those whose ISP's block Limewire pages 1 & 2 which has a link to alternative instructions. Another Insight proxy solution, http proxies, A Successful http Proxy Solution