[BUG] Unable to connect to Anthropic services

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?

windows 11
irm https://claude.ai/install.ps1 | iex
claude
Welcome to Claude Code v2.1.81
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Unable to connect to Anthropic services

Failed to connect to api.anthropic.com: ERR_BAD_REQUEST

Please check your internet connection and network settings.

Note: Claude Code might not be available in your country. Check supported countries at
https://anthropic.com/supported-countries
有vpn能本地可以正常访问https://www.anthropic.com/

What Should Happen?

如何才能正常使用claude code ?

Error Messages/Logs

Steps to Reproduce

1.irm https://claude.ai/install.ps1 | iex

1. claude -v

2.1.81 (Claude Code)
3.claude
Unable to connect to Anthropic services
Failed to connect to api.anthropic.com: ERR_BAD_REQUEST

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

v2.1.81

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_