Setup In order to execute this test, you should have a working CAS Server. There's a CAS VM on server to test this. Also, to establish connection between your moodle instance and the CAS server, you should change the _getServerBaseURL function on CAS/Client.php. The main reason is because CAS plugin by the default verify the host SSL and unless you have a HTTPS in your local machine, you should change this line. 1. Replace the https to http on line 315, the line should be exactly like this: $this->_server['base_url'] = 'http://' . $this->_getServerHostname(); 2. Log as admin and Go to Plugins > Authentication > Manage authentication. 3. Enable CAS server (SSO) and go to Settings. The config should be like this. Hostname: Your VM IP address Base URI: cas-server-webapp-3.5.2/ Port: 8080 CAS logout option: Yes Multi-authentication: Yes Testing 4. Create a user moodle or cas1 and set the authentication method to: CAS server (SSO) 5. Set the proxyhost and proxybypass to some ip address. (can be any) 6. Logout and click on Log In. 7. You will be prompted to choose the authentication method, choose CAS user. 8. Enter your cas user and password and click LOGIN. 9. Make sure you are able to log in using CAS server. 10. Click Log out.