AppNeta On-Prem utilizes a Remote Maintenance Tunnel to allow for AppNeta vPCA SME's to access the vPCA.
It is also advised for customers to enable the tunnel when they check the HealthCheck API Endpoint and if it returns an unhealthy status.
If the Remote Maintenance Page on the vPCA hasn't been populated before, below are the necessary details:
https://techdocs.broadcom.com/us/en/ca-enterprise-software/it-operations-management/appneta/GA/pca-intro/pca-upgrade.html