This site requires JavaScript to be enabled

Single Sign On: CAS Developer FAQ


2.0 - Updated on 07-25-2022 by Daniel Griffie

1.0 - Authored on 01-18-2019 by Sussan Kavoosi

In this article:

What version of CAS are you running?

We are running the Shibboleth IdP v4.0.1 which supports the CAS v3 protocol.


Who can authenticate with CAS?

All University of Maryland College Park (UMDCP) students, faculty, staff, and affiliates. Additionally employees and affiliates of UMES, UMCES, & USMO can authenticate.

For certain sites, former students and/or associates (guests) can authenticate. Please contact IT Service Desk if you desire this functionality.


What "username" is returned by CAS?

CAS will return the user's Directory ID. Additional attributes are available upon request.


Where can I learn how to use CAS with my web application?

See the CAS web site (note that we currently support CAS 1/2). In particular, you will want to check out the clients which have already been implemented in a variety of environments/languages.

Here is a little presentation on how a CAS authentication works.


What are the URLs for the UM CAS server?

Service Validate

See the CAS Protocol specification for details on the parameters.


How can I stay informed?

All users of CAS are strongly encouraged to subscribe to the UMDIRECTORY listserv list by sending a message to with a body of Subscribe UMDIRECTORY.


What if I have additional questions about CAS?

For additional questions and or assistance please contact the administrators at