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I am a complete noob when it comes to TCP/IP, but would like to open up my port for the Transmission bit torrent client on Snow Leopard Mac. Also, I am based in the UK if that has any relevance.

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Have you tried turning off your Firewall from  » System Preferences » Security » Firewall? –  slhck Jun 11 '12 at 8:53
    
Yes, my firewall is off. –  Eric Brotto Jun 11 '12 at 9:03
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I believe you have to forward that port from your router then, if it doesn't work automatically. Have you configured that already? See also PortForwardingGuide – Transmission –  slhck Jun 11 '12 at 9:05
    
@slhck How can I solve it if I want that port to be accessible from outside? Let's say it's just one port 41000? (Though I've forwarded this port and a whole range of it from my router to my Mac's IP - both TCP and UDP. I have also selected Transmission to "allow incoming connections"). Sometimes the port is close sometimes open. Using a VPN though solves the problem. And once it starts working (torrent downloading) then it keeps on working even if I turn the VPN off. Why is this odd behaviour? Is it my ISP? Or something on my Mac or router? –  amar Jun 10 at 15:14
    
@amar Sorry, not sure. Ideally your router would have UPnP configuration so that the client can automaically open a port. uTorrent can do that, but Transmission can't. –  slhck Jun 11 at 7:12

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