If you have a login or account-related issue, please check the following steps. The Contribuyentes server may be down and that is causing the login/account issue. Please try logging in after a few minutes. Your wifi / mobile data connection not working properly. Please check your data connection. You may be trying with the wrong login credentials. Please confirm the details that you are entering are correct. If you're using third-party social networks to log in such as Facebook, twitter, google, etc, check whether that service is working properly by visiting their official website. Your account may be banned or deactivated for activities. Please read the error messages carefully.