Are you playing on a public/work connection or have you changed providers recently? Some places block certain ports to stop people playing games and hogging bandwidth (not that anyone should be concerned about EQ of course).
I tried getting EQ running at my uni library a couple of years ago and something similar to what you're describing happened.
Other things to try if its a private/home connection. Disable your firewall (close your browser too), and see if it'll connect without that running. Also if you're running on a wireless connection, plug an ethernet cable in... or copy your EQ directory to someone's laptop to rule it out being something on your computer.
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