Cannot connect to server. Login server down, but server seems up.

Well, i've been getting this for a few days now. I see the server is up, but every time i try to log in it says connecting for a while and then login server down. I've tried to delete cache and WTF folders, and i've also tried unchecking read-only in files propreties, but i still get the login server down thing. Could anyone help me?

Uhm...also...i noticed there is a post just below this one that is also about connection problems, but he/she is getting another message so that's why i made a new post.