I've used Linux a bit, but I'm still a bit new. I've always had this problem, I'm running Xubuntu, but the last distro that I had was also xfce and had this problem too.
Basically, I can connect to my school wi-fi which is an enterprise setup (with cert and everything). However, when I come home and access one of the three networks I have access to it doesn't work. What happens is that I'll click it, the wheel will spin for maybe half a minute then say "disconnected". (I should also say that the first time it did ask for my password which was correct, I have re-entered it into the system several times too manually)
I can wire the connection, but this is obviously a temporary solution to a permiant problem (TStPP).
Help is appreciated.