Hi All, In foreman I checked hosts status and found one host was " out of sync ", I logined the box and check the status of puppet, no obvious issues found ( puppet was running at that point time). Then I tried to restart puppet and but failed (also no related log). /etc/init.d/puppet restart * Restarting puppet agent [fail] I had to delete the puppet pid file, rm -f /var/run/puppet/agent.pid , then restarted puppet and it worked. My OS is ubuntu 12.04 and the puppet version is " 2.7.11-1ubuntu2.1" What is root case of this issue ? Thanks. -- You received this message because you are subscribed to the Google Groups "Puppet Users" group. To view this discussion on the web visit https://groups.google.com/d/msg/puppet-users/-/TLf7iXAJWg8J. To post to this group, send email to puppet-users@googlegroups.com. To unsubscribe from this group, send email to puppet-users+unsubscribe@googlegroups.com. For more options, visit this group at http://groups.google.com/group/puppet-users?hl=en.