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debugging-network-issues

separate

Investigates network, streaming and protocol failures with falsification-first layered experiments, the general fallback for unknown root causes. Use for ECONNRESET / RST_STREAM / SSE stalls, CDN/CGNAT timeouts or certificate errors, throughput collapse where everything returns 200 but transfers crawl, or LAN identity/topology mysteries. Not for known Tailscale/TUN/DNS/proxy-path conflicts (use tunnel-doctor).

When to use

• ECONNRESET / RST_STREAM / SSE stalls
• CDN/CGNAT timeouts or certificate errors
• throughput collapse where everything returns 200 but transfers crawl
• LAN identity/topology mysteries
• Client-side proxy / VPN / TUN misrouting
• IoT devices offline after router/AP swap
• Cloudflare 524/522 on large POST bodies

When not to use

• known Tailscale/TUN/DNS/proxy-path conflicts
• macOS Tailscale ⨯ proxy/VPN conflict
• Cloudflare config issues
• Windows App / AVD / W365 RDP connection quality
• TLS certificate-verification errors on every DIRECT-routed domain
• proxy node / exit / chain capacity issues

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