Claude Code Proxy Transient Error Diagnosis | Generated by AI

Home 2026.07

Claude Code is working right now — the third-party proxy server is reachable and the auth token is valid. The error you hit was likely transient.

Here’s the full diagnosis:

Root Cause: transient failure of the third-party API proxy

Your Claude Code settings.json points to a non-official endpoint:

{
  "env": {
    "ANTHROPIC_BASE_URL": "https://claude2.sssaicode.com/api",
    "ANTHROPIC_AUTH_TOKEN": "sk-sss...0443"
  }
}

This is a third-party proxy that gives access to Claude models (Opus 4, in your case). It’s served behind Cloudflare and resolves to 50.87.93.246 in the US.

The connection path:

Claude Code CLI (Node.js)
  → https_proxy http://127.0.0.1:7890 (mihomo)
    → mihomo: no explicit rule for sssaicode.com → DIRECT
      → cloudflare → claude2.sssaicode.com

When I tested just now, it works — returns a valid response in ~2.8s. So the issue was temporary (the server was down for a few minutes, Cloudflare was re-routing, or there was a DNS hiccup).

Why you see “ConnectionRefused” instead of a more descriptive error: the Anthropic SDK’s Node.js HTTP client reports TCP-level failures as “ConnectionRefused” when the fetch/https module can’t establish a connection — transient server downtime, DNS failures, proxy routing blips all get lumped into this same message. There’s no retry/backoff at the SDK level that would mask a brief hiccup.

To make this more robust, you could:

  1. Add an explicit proxy rule for sssaicode.com so it always routes through your SS/Hysteria2 tunnels (not DIRECT), in case the direct connection from China is flaky:

    - DOMAIN-SUFFIX,sssaicode.com,Proxy

  2. Switch to the official Anthropic API (harder from China without reliable proxy) with ANTHROPIC_API_KEY instead of the third-party proxy. Though the third-party proxy seems to work fine otherwise — you got a response just now with Opus 4 costing $0.27 per request.

  3. Just retry — the error is transient. If you see it again, wait a minute and try again.

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