Unable to connect (correct realm list)

[seppuku420]

As the subject suggests I am unable to connect.
I had no issues until now and I've been playing for nearly a week now. The realm list is correct, the client is the same, it works with a realm list for different servers and I haven't been messing with any of the files.
What could be causing the problem?

[AverageJoe]

Have you tried to reset your password?