Another possiblity here is that your IP has been blacklisted from the masterserver. The IP you posted under isn't though. I can't actually see even just the 2 first octets of your IP anywhere in our masterserver logs .. no attempts, no blocking, nothing.
It may even be that your ISP is blocking those ports - some ISPs are like that!
Your best approach to clarify would be to come to IRC (java applet) (or IRC) and ask for the IP/hostname of one active server, then try connecting to that one manually - usually there'll be some people on IRC who are willing & able to help. Just stick around for a while, don't run off after 2 or 3 minutes! A response can often take more than 15 minutes, the really helpful people are usually busy with other applications/windows and you have to wait until they recheck the channel to notice your query! :)
It may even be that your ISP is blocking those ports - some ISPs are like that!
Your best approach to clarify would be to come to IRC (java applet) (or IRC) and ask for the IP/hostname of one active server, then try connecting to that one manually - usually there'll be some people on IRC who are willing & able to help. Just stick around for a while, don't run off after 2 or 3 minutes! A response can often take more than 15 minutes, the really helpful people are usually busy with other applications/windows and you have to wait until they recheck the channel to notice your query! :)