[BUG] Sandbox reports that github.com DNS resolution fails

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?

Cowork git push to GitHub stopped working after what appears to be an app update. The sandbox reports that github.com DNS resolution fails entirely via the localhost:3128 proxy. The automation ran successfully for approximately one month before breaking today.

What Should Happen?

The push should have worked as github.com is documented as one of the hardcoded allowed domains in the Cowork sandbox proxy. This is therefore a regression, not a configuration issue.

Error Messages/Logs

Steps to Reproduce

This was an automated push via Cowork and GitHub.com and API.github.com were not on the local allowed list.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

The version before. It worked yesterday. It stopped working before I updated the app. I updated the app and still didn't work.

Claude Code Version

Version 1.12603.1 (3df4fd)

Platform

Other

Operating System

macOS

Terminal/Shell

Other

Additional Information

Cowork on macOS desktop app. Scheduled run.