Disabling Security One may accidentally set up a security realm / authorization in such a way that you may no longer be able to reconfigure Jenkins. When this happens, you can fix this by the following steps: If this is still not working, trying renaming or deleting  config.xml . 1. Stop Jenkins (the easiest way to do this is to stop the servlet container.) 2. Go to  $JENKINS_HOME  in the file system and find  config.xml  file. 3. Open this file in the editor. 4. Look for the  <useSecurity>true</useSecurity>  element in this file. 5. Replace  true  with  false 6. Remove the elements  authorizationStrategy  and  securityRealm 7. Start Jenkins 8. When Jenkins comes back, it will be in an unsecured mode where everyone gets full access to the system. 192