Task Status Tab: Status shows "unable to register with server" or "received request to stop running tasks"
Altiris Agent Settings Tab: Network Status shows "Network usage is restricted"
Error Communications blockout in effect (-2147209952) in the Agent log file
Maintenance window is preventing communication
Blockout settings are preventing communication
To check the Maintenance Windows go to Settings > Agents/Plug-ins > Settings > Maintenance Windows All Managed Computers
To Check Blockouts go to Settings > Agents/Plug-ins > Settings > Maintenance Windows > Altiris Agent Settings