Sometimes TTD says you're firewalled when you're actually not (I think, because this seems to happen a lot: there are at least 3 threads a week about it). My suggestion is to restart everything: computer, modem, router, and try again. Your sudden decline in speeds may indicate that there actually is a problem, though.
This site will tell you if you're firewalled or not:
http://btfaq.com/natcheck.pl
make sure you enter the right port #.
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