[BUG] Claude Code 2.1.193 on Linux: getaddrinfo EREFUSED on all Anthropic domains

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Description:

Claude Code 2.1.193 fails to connect to any Anthropic service with getaddrinfo EREFUSED errors, but system curl works fine.

Environment:

• OS: Linux
• Location: Kenya
• Claude Code version: 2.1.193
• Commit: a1938d2a07a2
• Platform: linux-x64

Errors:

Failed to connect to api.anthropic.com: EREFUSED
Failed to connect to platform.claude.com: EREFUSED
Failed to fetch version from https://downloads.claude.ai/claude-code-releases/latest: getaddrinfo EREFUSED downloads.claude.ai

What works:

• ping 8.8.8.8 — succeeds
• curl -v https://api.anthropic.com — succeeds (HTTP/2 404)
• curl -v https://downloads.claude.ai — succeeds (HTTP/2 403)

What fails:

• claude login — getaddrinfo EREFUSED api.anthropic.com
• claude auth login — getaddrinfo EREFUSED platform.claude.com
• claude update — getaddrinfo EREFUSED downloads.claude.ai

Diagnosis:
Claude Code's bundled DNS resolver fails on Anthropic domains, but the system resolver (used by curl) works. This suggests a compatibility issue with Claude Code's DNS library in this network environment.

Output of claude doctor:

  Diagnostics ✔
  ├ Currently running: native (2.1.193)
  ├ Commit: a1938d2a07a2
  ├ Platform: linux-x64
  ├ Path: /home/moswil/snap/code/247/.local/share/claude/versions/2.1.193
  ├ Config install method: native
  └ Search: OK (bundled)

  Updates ⚠
  ├ Auto-updates: enabled
  ├ Auto-update channel: latest
  ├ Last update attempt: failed (install_failed) — 2026-06-27
  └ Failed to fetch versions

  Background server ◯
  ├ Mode: ephemeral
  └ See claude daemon status for details

  Remote Control ⚠
  ├ Remote Control requires a claude.ai subscription. Run claude auth login to sign in with your claude.ai account.
  ├ Not signed in to claude.ai
  ├ claude.ai subscription auth not active
  ├ Sign-in is missing the user:profile scope
  └ Organization not resolved

  Version locks ✔
  └ 2.1.193: PID 853212 (running)

What Should Happen?

Successful login

Error Messages/Logs

Steps to Reproduce

1. claude
2. claude auth login

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.195 (Claude Code)

Platform

Other

Operating System

Ubuntu/Debian Linux

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_