When using the Symantec Protection Engine (SPE) 9.x Management Console and REST API, you may need to elevate the logging to debug in order to troubleshoot communication or authentication errors.
C:\Program Files\Symantec\Scan Engine\RestAPI\log4j2.xml
/opt/SYMCScan/RestAPI/log4j2.xml
cd /opt/SYMCScan/RestAPI
./restapi.sh restart
C:\Program Files\Symantec\Scan Engine\RestAPI\log
/opt/SYMCScan/RestAPI/log
C:\Program Files\Symantec\Scan Engine Console\CMaF\logs