Most likely, your account password expired. UTD has a security policy requiring every user to update their UTD computer account (used for UTD eLearning access) password every six months.
You can log in at http://netid.utdallas.edu/ to update your password.
An email reminder with instructions for updating your password is sent to your UTD email account when it nears expiration.
If you don’t intend to login to your UTD email account regularly, you may set it up to forward all incoming emails to your preferred email account at https://netid.utdallas.edu/.
For any questions or assistance, please contact the UTD Help Desk online or by calling (972) 883-2911. Online students need to be able to access eLearning. We ask students to follow the password updating procedures to avoid any interruption of this access.