Dispatch/Cowork: ECONNRESET when connecting to API

Description

Getting API Error: Unable to connect to API (ECONNRESET) when trying to run dispatch for cowork.

Environment

• Claude Code version: 2.1.86
• OS: macOS (Darwin 25.1.0)
• Auth method: OAuth token (first party)
• ANTHROPIC_BASE_URL: https://api.anthropic.com

Debugging done

• Direct API connectivity works fine (curl to api.anthropic.com succeeds, TLS handshake completes, returns proper responses)
• DNS resolves correctly (160.79.104.10)
• No proxy environment variables set
• Auth status shows logged in
• Claude Code is on latest version (2.1.86)
• Anthropic status page shows all systems operational
• Uninstalled Cisco AnyConnect VPN — issue persists
• Multiple utun interfaces present (macOS system tunnels)

Expected behavior

Dispatch/cowork should connect to the API successfully.

Actual behavior

Connection resets with ECONNRESET error immediately.