Sometimes, the Orion Platform may not be able to automatically map the connection between your cloud server and on premise router, even if layer 2 and layer 3 topologies are being polled on the devices. This may happen if the devices are separated by a firewall, a VPN, or a NAT device that prevents the Orion Platform from discovering the link information. In such cases, you can manually create a custom connection between the cloud node and the on premise node on the Orion Map. You can also edit the properties of the custom connection, such as the name, the status, the bandwidth, and the utilization. By creating a custom connection, you can visualize and monitor the connection between your cloud server and on premise router on the Orion Map12. References:

Create custom connections on Orion Maps - SolarWinds

SCP Study Aid - SolarWinds (page 10)