Character cannot be found/disconnect

Well following the headline, that is what I meet whenever I try to log on one of my characters from this day.
I have been playing earlier today but just now I meet this "error".
What can I do to make myself able to enter WoW again?

Same is happening to me at the moment, it keeps saying that it cannot connect, and when I finally get in, it says it cant find my characters.

A bit of waiting resulted in me being able to login again.
Just wait an hour or two and you should be back online I think.

 
FAIL (the browser should render some flash content, not this).

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