[BUG] Cowork ECONNRESET on macOS - Unable to connect to API (Max plan)

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?

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report
• [x] I am using the latest version of Claude Desktop

Environment

• Device: Mac Mini
• macOS version: Tahoe 26.3
• Claude Desktop: Latest version 1.1.4498 (24f768)
• Subscription: Max plan
• Chip: M4

What's Wrong?

Cowork consistently fails with "API Error: Unable to connect to API (ECONNRESET)" on every task. Regular Chat mode works perfectly. Only Cowork is affected.

Steps to Reproduce

1. Open Claude Desktop (latest version, Max plan)
2. Switch to Cowork tab
3. Select a folder and start any task (e.g., "How many screenshots are inside this folder?")
4. Task shows "Working on it..." for ~5 minutes
5. Fails with: "API Error: Unable to connect to API (ECONNRESET)"

Expected Behavior

Cowork should connect to the API and complete the task.

Troubleshooting Already Attempted

• Confirmed host can reach API: curl -I https://api.anthropic.com returns HTTP/2 404 (cf-ray: 9d506213eea15989-DEL) ✅
• No VPN or proxy active
• Deleted local-agent-mode-sessions folder
• Cleared cache and restarted
• Restarted Mac
• Reinstalled/updated Claude Desktop
• Regular Chat mode works perfectly — only Cowork is broken

Additional Context

This has been happening since I subscribed to Max. I have never been able to use Cowork successfully.

What Should Happen?

Cowork should start successfully, connect to the Claude API, and complete the task. The task should return results within seconds, the same way regular Chat mode works without any issues.

<img width="1226" height="953" alt="Image" src="https://github.com/user-attachments/assets/f2e49e38-8c5c-4733-b456-4b16065a2b53" />

Error Messages/Logs

API Error: Unable to connect to API (ECONNRESET)

Steps to Reproduce

Enter this:

1. Open Claude Desktop (latest version) on macOS Mac Mini
2. Log in with Max plan subscription
3. Switch to the "Cowork" tab
4. Click "Work in a Folder" and select any local folder
5. Type a simple task like "How many screenshots are inside this folder?"
6. Press Enter
7. Cowork shows "Working on it..." with spinning indicator
8. Wait ~5 minutes
9. Task fails with: "API Error: Unable to connect to API (ECONNRESET)"
10. Try again with a new task — same result every time

Note: Regular Chat mode works perfectly on the same machine, same network, same session. Only Cowork is affected. Host can reach API confirmed via:
curl -I https://api.anthropic.com → HTTP/2 404 (success, cf-ray: 9d506213eea15989-DEL)

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude 1.1.4498 (24f768) 2026-02-26T19:47:09.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_