WotLK can't login,redownloading doesn't help much

[teemomidftw]

i was having problemn with loggin in ,so i decided to check the forum and i read that i have to redownload the game so i did it. The first time i tried to log it worked,but now i cant log again. Can someone tell me permanent fix to this bug ?

[skullatbash]

you need to provide more info.

What kind of message do you get when you fail to log-in?

[teemomidftw]

Unable to connect.Please retry later.If the problem persist,please......
this kind of message