Talk:Proxy Connection and Troubleshooting/@comment-26412506-20150618122850/@comment-26292999-20150618125030

It says that your account has been temporarily locked as they detected suspicious activity on it (e.g. multiple failed login attempts). To unlock your account, you need to reset the password by clicking the button on the bottom of that page, then entering you email address registered with DMM. You will then be sent an email which will direct you to the password reset page. From there, enter a new password that is different to all the others you have used before. Once copmleted, you should be able to login again.

If you have followed all of these steps already, then unfortunately I don't know what else might be the problem.