title: Unable to reconnect jenkins slave automatically after restart
body: <p>I have a Jenkins master (Linux Debian) and 4 slaves (Windows 7) which are connected via JNLP. 
  The jenkins slave service works well in each slave. However when I restart a slave machine, the connection breaks down for all the slaves and the reconnection is established again only if the Jenkins master is restarted.</p>
  
  <p>What should I do?</p>