{Client} Unable to Log In

For whatever reason, I'm unable to get past the login screen on the client. I'm connected to my internet just fine, and everything else on the client seems to be in order. But once I log in, it verifies my account and then just spends a full minute saying 'logging in...' before saying that it can't log me in and closing the client. I was playing just fine yesterday, so I'm assuming it's some kind of server problem. Anyone else having this issue?