Tasks will not run on a client machine with a Console error message "Object TaskServerHandler is not installed". On the Task Status tab in the Agent UI, the Status is listed as 'Agent not Initialized'.
<event date="XXX XX XX:XX:XX" severity="2" hostName="<HOSTNAME>" source="Agent" module="AeXNSAgent.exe" process="AeXNSAgent.exe" pid="4236" thread="4560" tickCount="1266053203"><![CDATA[Object TaskServerHandler is not installed: Invalid class string (-2147221005). This situation should be resolved once the agent rollout has been completed.]]></event>
This is caused by the Client Task Agent.dll not being registered with the Operating System.
Most commonly this has been observed to be caused by an upgrade to the product/agent and results immediately thereafter. However, it has been observed under other circumstances/environments in which case the exact cause has not been determined.
Symantec Management Platform SP4, SP5
Client Management Suite SP1, SP2