[BUG] API Error: Unable to connect to API: Self-signed certificate detected.

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?

<img width="778" height="105" alt="Image" src="https://github.com/user-attachments/assets/27e57778-0127-4c02-85c4-4f43652c17d8" />

API Error: Unable to connect to API: Self-signed certificate detected. Check your proxy or corporate SSL certificates

It suddenly fails. Nothing changes in my system. Not under proxy, normal home internet.

What Should Happen?

Should work without error.

Error Messages/Logs

`API Error: Unable to connect to API: Self-signed certificate detected. Check your proxy or corporate SSL certificates`

Steps to Reproduce

Just sent hello prompt in Claude Code CLI.

Claude Model

Not sure / Multiple models

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Claude Code v2.1.201

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

_No response_