This guide details the troubleshooting processes for FDM-managed devices within the Security Cloud Control Firewall Management system. It outlines various troubleshooting scenarios, including device registration failures, connectivity issues, and SSL decryption problems. The document describes specific steps to resolve issues such as insufficient licenses, invalid registration keys, and device unregistration. It also provides guidance on checking device connectivity, compatibility of software versions, and logging settings. Additionally, the guide explains how to handle SSL pinning issues that may prevent app connectivity while allowing browser access. Each troubleshooting section is structured to follow a logical order, detailing procedures and considerations necessary for effective resolution of common problems encountered during device onboarding and management. Related information and references are provided to assist users in navigating the troubleshooting process effectively.