This document outlines a structured approach to debugging distributed systems. It begins with observing and documenting the problem. The next steps involve creating a minimal reproducer, debugging the client and server sides, and checking DNS, routing, and network connections. Additional steps include inspecting traffic, attaching remote debuggers, and conducting a post-mortem analysis. Throughout the process, various tools can help with tasks like logging, testing, and network inspection. The document concludes by emphasizing the importance of understanding failure modes through experience debugging real issues with distributed systems.