[BUG] Unable to start session. Check your internet connection and try again.

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?

When sending a prompt into any of my Claude Code sessions, I get the following message: "Try sending your message again. If it keeps happening, share feedback so we can investigate. Unable to start session. Check your internet connection and try again."

My device has a stable internet connection, everything is working, even Claude Chat but when sending any message to Cowork or Code they bounce and I get this warning. It has been like this since 3 weeks. I run the command /feedback which is the only one that goes through and opens a pop-up window, but when writing the report and clicking submit, I get this warning message: "Couldn't send feedback. Please try again."

What Should Happen?

Claude should answer to my propmts as usual.

Error Messages/Logs

Steps to Reproduce

Send any message to Claude Code - they just bounce back on my server.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude 1.14271.0 (c8f4d8) 2026-06-18T05:47:57.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_