That only happens to a banned player and there is no ban related to your acount or ip adress. Have you tried to login with a banned acount? it could happen to you if you did -)) (and i wont tell u how to fix that in this case)
To reset ur password u have just to click on the reset window and write the mail adress u already registred with in your acount. After that, you have to wait for the e-mail sent by king servers. u open ur inbox, open the e-mail and follow the instructions to change your password.