DC Agent has insufficient permissions
DC Agent may have been installed as a service using the Guest account, equivalent to an anonymous user to the domain controller.
In order to perform computer polling, the Websense DC Agent service requires domain admin permissions. In some environments (typically very large enterprise networks), DC Agent requires enterprise admin permissions.
If you have disabled domain discovery and computer polling, and are just using domain controller polling while maintaining the dc_config.txt file manually, DC Agent can run as any network user with read access to the domain controller.
To grant DC Agent domain admin privileges: