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.
What should I do?
Much more information is needed to investigate this. Consider installing Support Core plugin and attaching a support bundle to this report.
Also, please read: https://wiki.jenkins-ci.org/display/JENKINS/How+to+report+an+issue
Also note this is an issue tracker, not a support site. If you're looking for help, e.g. workarounds, you're in the wrong place.