Enforce displays Agent as "Not Reporting" if it hasn't checked in to an Endpoint Server during a set interval. The user wants to change this interval setting.
No error message.
To configure the agent connection status:
Settings you make on this screen apply to all registered Endpoint Servers. The minimum value you can enter is 5 minutes, up to a maximum value of 9999 hours and 59 minutes. The default value is 18 hours.
Best practice for the "Agents not reporting after" interval is 18 - 72 hours.
Note: The setting you enter should be greater than the agent polling interval (default of 15 minutes - 900 seconds):
(See: System > Agents > Agent Configuration > Advanced agent settings to configure this value.)
Refer to the official guide:
DLP 16.0 Configuring the agent connection status
DLP 15.8 Configuring the agent connection status
You may want to review: Article ID: 170468 DLP Agent status not reporting as expected on Enforce