Service Summary

Central Authentication Service (CAS) is a single sign-on service used by a variety of Mason websites and applications to authenticate individuals. Its purpose is to permit users to access multiple sites while providing their credentials (NetID and Patriot Pass Password) only once.

If you are not enrolled in Two-Factor Authentication (2FA), you will not be able to access any CAS-enabled websites/applications. If you attempt to log in with your NetID and Patriot Pass Password, your access will be denied. You must enroll in 2FA immediately in order to access these systems.

Key Features

CAS coupled with 2FA offers a secure environment for sensitive data.

Getting This Service

To log in to CAS, Mason employees enter their NetID and Patriot Pass Password (first factor) and confirm their identity using a physical device (second factor). The physical device may be a smartphone, tablet, mobile phone, landline phone, or Yubikey.


This service is available 24/7, excluding planned outages, normal maintenance windows, and unavoidable events. Maintenance windows are Sundays from 7 to 11 a.m. but may be extended to 2 p.m., if needed. If maintenance is required outside of these hours, it will be announced on the Alerts & Bulletins page.