title: Configure tomcat for SSO using cas
body: <p>I am trying to create SSO login for two of my grails app. I managed both the app to redirect to CAS login page but the SSO is not working. I am prompted with the login page even if I have already logged in using the other app. I tried adding this to server.xml of tomcat</p>
  
  <pre><code>&lt;Valve className="org.apache.catalina.authenticator.SingleSignOn" /&gt;
  </code></pre>
  
  <p>but still no effect !
  I have to login via the CAS login page for both the apps. What am I missing. Please help.</p>