That's a great problem description.
Now I know really exactly whats wrong and can say you how to fix it.

No...I was just joking.
You should give me exactly the message you get when you try to login.
Everything else will not result in fixing your problem.

Wrong password? Weak network? Forbidden network? There should be a lot of reasons.
Yey, you should provide exactly the message you get when you try to login.