The agent remains offline after upgrading it via Automation Studio.
Release : 6.7
Component : Nolio Release Automation Core
Manually uninstall the agent and reinstall.
The issue was found while using Automation Studio (ASAP) in version 6.7. However, Automation Studio has been discontinued in this version and is available for only the most dire of situations where something from ASAP was not ported to the ROC. Version 6.7 provides a new way/method of upgrading agents via the ROC. In version 6.8 the old Automation Studio method of upgrading agents has been ported to the ROC and this problem has been fixed there. The fix involves specifically removing symbolic links before it attempts to delete folders. The upgrade process itself, in the 6.8 ROC, firsts prompts whether you want to use the new upgrade procedure. If you deselect this option then it will use the previous/ASAP method where this fix has been implemented to improve how the upgrade process handles the removal/upgrade of the JRE.