Sustained ECONNRESET on streaming connections - Claude Code VS Code extension (Santiago, Chile / SCL region)

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?

claude code version 2.1.220 (Claude Code)

What's Wrong? Claude Code in the VS Code extension repeatedly fails with ECONNRESET after exhausting all retry attempts, even during short tasks. The connection is reported as stale before failing.

Environment

Client: Claude Code extension for VS Code
Model: claude-sonnet-4-6
Region: Santiago, Chile (SCL)
Date/time of occurrence: 2026-07-29T19:29:03Z

Steps to Reproduce

Open Claude Code in VS Code
Ask Claude Code to perform any task (even small ones)
Connection fails after retries with ECONNRESET

Relevant log

2026-07-29T19:29:03.717Z [DEBUG] Stale connection — disabling keep-alive for retry
2026-07-29T19:29:03.739Z [DEBUG] [API:timing] dispatching to firstParty model=claude-sonnet-4-6
2026-07-29T19:29:03.740Z [DEBUG] [API REQUEST] /v1/messages x-client-request-id=9a908b5e-b3d9-46f0-91ef-fae390030ab5 source=sdk
2026-07-29T19:29:03.761Z [ERROR] API error (attempt 11/11): undefined Connection error.
2026-07-29T19:29:03.761Z [ERROR] Error in API request: Connection error.
2026-07-29T19:29:03.761Z [ERROR] Connection error details: code=ECONNRESET, message=The socket connection was closed unexpectedly.
2026-07-29T19:29:03.761Z [ERROR] API error x-client-request-id=9a908b5e-b3d9-46f0-91ef-fae390030ab5 (give this to the API team for server-log lookup)
2026-07-29T19:29:03.761Z [ERROR] API connection_error after retries: Connection error.

x-client-request-id for server-log lookup 9a908b5e-b3d9-46f0-91ef-fae390030ab5

Troubleshooting already performed

Confirmed api.anthropic.com is reachable (TCP/TLS handshake succeeds)
No VPN/proxy in use
Verified Anthropic status page shows green at time of failure
Issue occurs consistently, not tied to a specific task size or complexity
Consistent with other reports suggesting Cloudflare edge nodes in the SCL (Santiago) region may be closing idle/streaming connections prematurely

What Should Happen?

Claude Code in the VS Code extension repeatedly fails with ECONNRESET after exhausting all retry attempts, even during short tasks. The connection is reported as stale before failing.

Error Messages/Logs

2026-07-29T19:29:03.717Z [DEBUG] Stale connection — disabling keep-alive for retry
2026-07-29T19:29:03.739Z [DEBUG] [API:timing] dispatching to firstParty model=claude-sonnet-4-6
2026-07-29T19:29:03.740Z [DEBUG] [API REQUEST] /v1/messages x-client-request-id=9a908b5e-b3d9-46f0-91ef-fae390030ab5 source=sdk
2026-07-29T19:29:03.761Z [ERROR] API error (attempt 11/11): undefined Connection error.
2026-07-29T19:29:03.761Z [ERROR] Error in API request: Connection error.
2026-07-29T19:29:03.761Z [ERROR] Connection error details: code=ECONNRESET, message=The socket connection was closed unexpectedly.
2026-07-29T19:29:03.761Z [ERROR] API error x-client-request-id=9a908b5e-b3d9-46f0-91ef-fae390030ab5 (give this to the API team for server-log lookup)
2026-07-29T19:29:03.761Z [ERROR] API connection_error after retries: Connection error.

Steps to Reproduce

Open Claude Code in VS Code
Ask Claude Code to perform any task (even small ones)
Connection fails after retries with ECONNRESET

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.220

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_