Recently I messed up with Jenkins security configuration causing my slave machines to
no longer connect to the master with the following exception logged:
Failing to obtain http://MY_JENKINS/computer/MY_SLAVE_NAME/slave-agent.jnlp
java.io.IOException: Failed to load http://MY_JENKINS/computer/MY_SLAVE_NAME/
slave-agent.jnlp: 403 Forbidden
at hudson.remoting.Launcher.parseJnlpArguments(Launcher.java:275)
at hudson.remoting.Launcher.run(Launcher.java:219)
at hudson.remoting.Launcher.main(Launcher.java:192)
Waiting 10 seconds before retry
Check your security configuration settings in Manage Jenkins->Configure global
security and verify that for Anonymous user you have allowed to connect to slave.
