When installing from rpm, the Data Collector configuration directory is installed as /etc/sdc.
rpm leaves the permissions in place as 755, owned by root:root. In this case, root permissions are required to configure Data Collector.
Also, after configuration is complete, registering with Control Hub requires permissions to update dpm.properties and application-token.txt which are stored in /etc/sdc. Accessing these files fails since Data Collector is usually running as sdc:sdc or as a service account.
In order to permit user sdc to update these files, please `chown -R sdc:sdc /etc/sdc` Also, you may need to replace sdc:sdc with your service account and group.