Troubleshooting Use the following scenarios to troubleshoot any onboarding issues. Troubleshoot Cloud-Delivered Firewall Management Center Connectivity with TCPTroubleshoot Threat Defense Device ConnectivityTroubleshoot Device Connectivity Loss After Cloud-delivered Firewall Management Center UpdateTroubleshoot Onboarding a Device to the Cloud-Delivered Firewall Management Center Using the CLI Registration KeyTroubleshoot Onboarding a Device to Cloud-Delivered Firewall Management Center Using the Serial Number