Client Task Server is not processing jobs and sending status back to the SMP Server.
Possible other statuses:
ITMS 8.x
Anti-virus
In this particular instance, turns out McAfee was flagging the ATRSHOST.exe as malware because it was reaching out to the machinekeys folder on the workstations.
Short term resolution:
Remove McAfee, if possible, and Task Services should start working again.
Long term resolution:
Work with the Security team to not have antivirus software monitor Altiris processes.