Login failed: getaddrinfo ENOTFOUND alb-cache - OAuth callback exposes internal hostname

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?

Environment:

Claude Code version: 2.1.87
OS: macOS
Network: Multiple networks tested (university WiFi + mobile hotspot)

Bug description:
After completing browser OAuth authorization, login fails in terminal with:
Login failed: getaddrinfo ENOTFOUND alb-cache
The OAuth flow uses this redirect_uri:
https://platform.claude.com/oauth/code/callback
After browser authorization succeeds ("You're all set up"), Anthropic's servers attempt to deliver the token back to my machine via a hostname called alb-cache, which is an internal Anthropic infrastructure name that cannot be resolved externally. This happens on every network I've tried.
What I've verified:

Network connectivity to api.anthropic.com is fine (Node.js resolves and connects successfully)
Browser auth completes successfully every time
Token never reaches the terminal
~/.claude.json contains a userID but no auth token
DISABLE_TELEMETRY=1 does not fix the issue
Clearing ~/.claude.json and ~/.claude/ and retrying does not fix the issue

What Should Happen?

Expected behavior: Login should complete successfully after browser authorization.
Actual behavior: Terminal receives ENOTFOUND alb-cache — an internal Anthropic hostname that should never be exposed to end users.

Error Messages/Logs

Welcome to Claude Code v2.1.87

 Unable to connect to Anthropic services

 Failed to connect to api.anthropic.com: ENOTFOUND

 Please check your internet connection and network settings.

Steps to Reproduce

Run claude from the terminal

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.87 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

Attempted debugging was via conversations with Claude desktop