[BUG] ECONNRESET errors - Unable to connect to API despite healthy network

[dhawalshah]

Preflight Checklist

• I have searched existing issues and this hasn't been reported yet
• This is a single bug report (please file separate reports for different bugs)
• I am using the latest version of Claude Code

What's Wrong?

Environment

• Platform: Anthropic API (Claude Max)
• Claude Code version: Latest (CLI and VS Code extension)
• Operating System: macOS (MBP 2024)
• Terminal: VS Code integrated terminal / native terminal
• Model: Opus 4.5

Claude Code suddenly stopped working after functioning normally for several hours. The CLI and VS Code extension both fail with ECONNRESET errors when attempting to connect to the API.

✅ DNS resolution working (160.79.104.10)
✅ TCP connection successful on port 443
✅ TLS 1.3 handshake completed
✅ SSL certificate valid
✅ HTTP/2 working
✅ API responding (Cloudflare, cf-ray: 9ac3602f1d468958-SIN)

This confirms the issue is not with my local network, firewall, VPN, or DNS.
Steps to Reproduce

Open Claude Code (CLI or VS Code extension)
Attempt any operation (even just viewing auth status)
Connection fails with ECONNRESET after multiple retry attempts

What Should Happen?

Claude Code should connect to the API and function normally, as it did 2-3 hours prior.

Error Messages/Logs

**Primary error (CLI):**

> auth
└ Unable to connect to API (ECONNRESET)
  Retrying in 11 seconds… (attempt 6/10)

**Telemetry errors (VS Code extension output):**

2025-12-11 15:31:32.486 [info] From claude: 2025-12-11T07:31:32.486Z [ERROR] "Error: Error: {"message":"Failed to export 49 events","originalLine":"426","originalColumn":"34293","line":"426","column":"34293","sourceURL":"/$bunfs/root/claude","stack":"Error: Failed to export 49 events\n at doExport (/$bunfs/root/claude:426:34293)\n at processTicksAndRejections (native:7:39)"}"

2025-12-11 15:31:40.825 [info] From claude: 2025-12-11T07:31:40.824Z [ERROR] "Error: Error: 1P event logging: 6 events failed to export\n at queueFailedEvents (/$bunfs/root/claude:426:35104)\n at doExport (/$bunfs/root/claude:426:34215)\n at processTicksAndRejections (native:7:39)"

**Network Diagnostics**
I verified that network connectivity to api.anthropic.com is healthy:
`bash$ curl -v https://api.anthropic.com/v1/messages`
**Result:** Connection successful (HTTP/2 405 - expected for GET request)

Steps to Reproduce

1. Open Claude Code (CLI or VS Code extension)
2. Attempt any operation (even just viewing auth status)
3. Connection fails with ECONNRESET after multiple retry attempts

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

2.0.65

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

Troubleshooting Already Attempted

• Restarted VS Code
• Logged out and logged back in (claude auth logout / claude auth login)
• Reinstalled Claude Code CLI
• Verified network connectivity with curl
• Confirmed not hitting rate limits (on Max plan)
• Checked official status page (shows operational)

Additional Context

Third-party status monitors (IncidentHub, StatusGator) show Claude Code as "Affected" with 45+ user reports in the past 24 hours, despite the official status page showing operational.
The issue appears to affect Claude Code's persistent/streaming connections specifically, while simple HTTP requests succeed.
This suggests a server-side issue with the connection handling for Claude Code clients that hasn't been acknowledged on the official status page yet.

Request
Could the team please investigate? It appears this may be affecting multiple users based on third-party monitoring data.

[github-actions]

Found 3 possible duplicate issues:

1. Persistent ECONNRESET Errors on macOS Network Connections #5674
2. [BUG] API Error (Connection error.) with TypeError (fetch failed) #8030
3. Persistent API Connection Failures During Fetch Requests #3131

This issue will be automatically closed as a duplicate in 3 days.

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🤖 Generated with Claude Code

[huangsen365]

I met the same issue...

[hn-alchemist]

Same issue still

[tickcode]

Still an issue...

[dacort]

I had a similar issue I was able to fix by tweaking my wifi MTU setting, details here: #5674 (comment)

[brianlellis]

Same issue, they auto close a lot of bugs.

#653

But yeah, I just cancelled my subscription. It's been a week of trying to get it to work.