To upgrade Jenkins from version 1.466.2 to version 1.557, I replaced the old jenkins war file with jenkins war file in the directory /usr/share/jenkins. Then on restarting the jenkins from command line I started getting the new Jenkins version 1.557. But sometime later I messed with security part of it, I checked the security check box while configuring Jenkins. Now I am not able to use Jenkins, if I go to myproject.com:3300 it gives me error: hudson.security.AccessDeniedException2: anonymous is missing the Overall/Administer permission.
To fix this error I found that I need to change <usesecurity> from true to false. But when I go to the var/lib/jenkins (which home directory of Jenkins) to edit config.xml. I am still seeing the old version version 1.466.2 but in GUI at myproject.com:3300 it shows new version.
I am stuck here, please let me know what am I missing, how can I get it running.