title: Jenkins Github oAuth 404 error in callback
body: <p>i am trying to use Jenkins' Github oAuth plugin (https://wiki.jenkins-ci.org/display/JENKINS/Github+OAuth+Plugin)</p>
  
  <pre><code>Name: Name of app
  URL: http://server:8080
  Cacllback: http://server:8080/securityRealm/finishLogin
  </code></pre>
  
  <p>When i enable Github oAuth, it did pop up to say whether I want to allow this Appliation from Github, then I click Allow. </p>
  
  <p>So the authenticate step went through, but I hit 404 because <strong>The requested resource (/securityRealm/finishLogin) is not available.</strong></p>
  
  <p>There is nothing in Tomcat manager that says securityRealm, is there something else I need to set up to use this plugin?</p>