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>
This article is part of our Knowledge Base and is provided for guidance-based purposes only. The solutions or workarounds described here are not officially supported by CloudBees and may not be applicable in all environments. Use at your own discretion, and test changes in a safe environment before applying them to production systems.