Wait. And nothing else. Just wait.
In no case press Disconnect and Connect again and again!

The client does not get stuck. It is probably just the database under heavy load and it needs a while to handle your request.

The worst you can do is to press Disconnect and Connect again and again. By doing that, the authorization process just starts from the beginning again and needs longer again. In addition you increase the database load and make all get even worse. So please just wait.

If you are not connected after waiting 5 minutes, try again, maybe the server was restartet during that time. If it is still not working then, please wait another 10 minutes before notifying the admins. It really can take that much time.