Many (by seeing the amount of posts one could almost say too many, but it's all relative: nobody posts to say: "I can connect"...) people have a no-connection problem.
Go to
www.java.com and download the latest version of the soft for your OS. (Java is a particularly useful thing to have. Browsers use it for some sites, chat rooms, some apps use it...).
Now, install the latest Java and read the (at least) the first post of
this thread. Do as it says.
Does it connect now?