A system and method is presented for verifying the ability to use stored authentication information when accessing a remote media service. A media device, such as a television, is described that stores authentication information for a remote media service. Such authentication information may include a user name and a password. Because media devices may be re-sold, returned for re-sale, or refurbished, it is necessary to automatically disable the authentication information to prevent a second owner from accessing the services and accounts belonging to a first owner. The ability to use authentication information is disabled upon a long delay in accessing the service, a complete power down cycle, a change in IP address, or a change in network interfaces used to access the network.