Does Single Player work?
I have this same proplem i tried to re forward but it doesnt work, single player works and i can join other servers.
did you use portforward.com? this one helps alot more try it scroll down and pick your Internets name (look on you main internet box) and what the code is (userly on the bottom or back of it) and then go on it another section will come up go to B and look for blockland and after going on that DO THE *never miss this part* BIT OUT!.
I had the same problem, but it was my internet connection, nothing to do with ports. I was connected through an LAN cable and had it enabled, but when I disabled that and connected through Wireless it worked.
And how was this done?