There is an issue with PKCS12 truststores for REST Appliance. When an appliance is configured with a truststore created using OpenSSL in PKCS12 format, the appliance
silently fails. The REST Appliance detection service does not correctly initialize fully and is therefore stuck in a waiting state. So all detection requests to the Appliance fail, since detection service is not actually running. When the appliance fails, an error is shown in Enforce system events, and on the REST Appliance.
Do not use OpenSSL to create a truststore with the Symantec Data Loss Prevention REST Appliance