patience is the key in this case. As someone has said before in this help section.
Look at the online users counter in the top left corner of the site. If it keeps dropping instead of staying at the same amount or increasing around busy times, it will not connect for you and will keep dropping users so there's not point in connecting over and over. Once you notice the users are stable or much more than it were before, then you can assume the server lets people in again.
Save you the hassle of derping about at a login screen that will not let you in, nor a forum that will not fix your issues right away.