Resolution
You will need to manually edit the agent’s config.xml
file to remove the
temporary offline lines:
<temporaryOfflineCause class="hudson.slaves.OfflineCause$UserCause"> <description> <holder> <owner>hudson.slaves.Messages</owner> </holder><key>SlaveComputer.DisconnectedBy </key> <args> <string>anonymous</string> <string/> </args> </description> </temporaryOfflineCause>