At IU, what should I do if I have trouble logging into CAS?

At Indiana University, the CAS (Central Authentication Service) login service allows you to access multiple IU computing systems after entering your IU username and password only once on a central authentication server. This is often referred to as single sign-on.

If you're having trouble, consider:

Note:

On August 11, 2016, Indiana University's CAS (Central Authentication System) for passphrase-protected logins was updated with a new landing page that reflects IU's latest branding guidelines, security features, and functional updates. For more about the redesign, see About the CAS redesign.


Who can use CAS?

CAS allows access to IU computing resources to:

Login issues

  • IU username and passphrase: If you cannot log into CAS using your IU credentials, try resetting your passphrase.
  • If the problem persists, your IU ADS domain account may be locked for some reason; see At IU, why is my ADS domain account locked?

    To have your ADS account unlocked immediately or request additional troubleshooting, contact your campus Support Center.

  • IU Guest account: If you cannot log into CAS using your IU Guest account credentials, try changing or resetting your Guest account password:
    1. Go to Guest Accounts in One.IU, and click Start.

    2. On the left, click change your Guest password, and then follow the on-screen prompts.

    If the problem persists, contact an IU campus Support Center for help.

  • IU Extranet account: If you cannot log into CAS using your IU Extranet account, contact your IU campus Support Center for help.

Two-Step Login (Duo) issues

If you have not enrolled in Two-Step Login (Duo) and attempt to access sites, applications, or systems that require it, you'll see the following message:

Access Denied. The username you have entered cannot authenticate with Duo Security. Please contact your system administrator.

If you receive this notice after logging into CAS and believe you should have access to the system in question, follow the appropriate instructions in Getting started with Two-Step Login (Duo) at IU.

If you are enrolled in Duo and are having difficulties with two-step login, see Managing your Two-Step Login (Duo) devices and settings.

For help, contact your campus Support Center.

This is document alpu in the Knowledge Base.
Last modified on 2016-09-28 10:28:10.

  • Fill out this form to submit your issue to the UITS Support Center.
  • Please note that you must be affiliated with Indiana University to receive support.
  • All fields are required.

Please provide your IU email address. If you currently have a problem receiving email at your IU account, enter an alternate email address.

  • Fill out this form to submit your comment to the IU Knowledge Base.
  • If you are affiliated with Indiana University and need help with a computing problem, please use the I need help with a computing problem section above, or contact your campus Support Center.

Please provide your IU email address. If you currently have a problem receiving email at your IU account, enter an alternate email address.