# Debugging Network Issues

> - Investigates network, streaming, and protocol failures with falsification-first layered experiments. Use for ECONNRESET, HTTP/2 RSTSTREAM, SSE or long-polling stalls, fixed-time drops, CDN/proxy/CGNAT timeouts, client-side proxy/TUN misrouting, CNAME-rule surprises, certificate errors, generic throughput collapse where everything returns 200 but transfers crawl, or LAN identity/topology mysteries. Trigger phrases include "socket closed unexpectedly", "stream interrupted", "fails after N seconds", "works sometimes but not always", "upstream silent for X seconds", ERRCONNECTIONCLOSED, SSLERRORSYSCALL, UNKNOWNCERTIFICATEVERIFICATIONERROR, and wrong-site certificate. Treat this as the general method and unknown-root-cause fallback. Use tunnel-doctor for known Tailscale/TUN/DNS/route/WSL-Docker conflicts and for a confirmed proxy exit/node/chain quality problem.

## Facts
- Page: https://tashan.sh/capability/skill-daymade-debugging-network-issues
- tashan id: skill:daymade/debugging-network-issues
- Source: https://github.com/daymade/claude-code-skills
- Type: skill
- Category: other
- tashan score: not scored (catalogued only — too little public evidence)
- Adoption: 9.0
- Upkeep: 97.0
- Freshness: 93.0
- Evidence coverage: 84% of the inputs this score can use
- Health: active
- Instruction depth: not yet graded
- License: MIT
- Official: no

## Install

```sh
cp -r debugging-network-issues ~/.claude/skills/
```

## Security audit
Not scanned. We audit npm-published capabilities; this one has no npm package we can resolve, or has not reached the queue. This is not a clean bill of health.

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Measured 2026-09-12 by tashan (https://tashan.sh) from public evidence. Scorer s5.