Try changing your country IP lock setting. This is a new protection put in place to help protect accounts from being hacked. You can change this by requesting a password reset at https://en.nostalrius.org/password. It will send you an E-mail, and when you click on the link in the E-mail, you will need to update your password and select a new country lock setting.
If the country lock is suitable for your situation, then set it to 'No Country Lock' and make sure the password you choose is complex.