Why can I log in the game on another wifi but at home its not working anymore??

I use to play at home on my 4mbps wifi but now only I can log on..well connect to server on a faster meg line why did it change??

Your home IP address is blocked in the game? There's no path from your home wifi to the game server? There are many possibilities. Unless it's the first one (you cheated, you did things you weren't supposed to), you'd need someone knowledgeable about the internet in your home to see what's wrong. Someone who can do a ping and a traceroute, for example.