CASRB0048I has SNT-Update authority-- security default is enabled.

The system is upgrading an older RDF file by adding security configuration details. Security is initially enabled, since the installation default userid (SYSAD) was not found with its original password (SYSAD), and at least one userid was found with SNT-Update authority.
System Action:
System security defaults to enabled.
Resolution:
If you do not want security on your system, run dfhpcupg with the /u /p and /ss- parameters.
Module:
dfhpcupg
Destination:
Stdout and rdoupgrd.log