Terminal Server

Ola galera,De repente o terminal server aqui do servidor deu pau...Quando tento logar no server (Windows 2003 EE), ele dá a seguinte mensagem:"The log on this remote computer, you must have terminal server user access permissions on this computer. By default, members of the remote desktop user group or another group that has these permissions, or if the remote desktop user group does not have these permissions, you must be granted these permissions manually."Alguem poderia me ajudar... aconteceu isso sem ninguem fazer absolutamente nada...Agradeço desde já