SOURCE Quote: http://www.cnblogs.com/xiami303/p/3625829.html
Accidentally, forgot the Admin user's account password. Then you can not see the Manage Jenkins part of the content, see not to change the user rights, that is, the system is paralyzed.
So, thinking of starting unregistered account and password, can be seen, that is, there is no sign in and sign up module, is available, this information should be written in the Jenkins configuration file.
Table of Contents:/var/lib/jenkins/config.xml
The following items need to be removed:
<useSecurity>true</useSecurity>
<authorizationstategy class= " Hudson.sucrity.FullControlOnceLoggedInAuthorizationStrategy "> ...
</authorizationStategy>
<securityrealm class= "Hudson.security.HudsonPrivateSecurityRealm" >
<disableSignup>false</disableSignup>.
.
</securityRealm>
And then restart Jenkins,
sudo service Jenkins restart
You don't have to login to see Manage Jenkins.