Claude Code / AI Coding Tools

Claude Code ECONNRESET — Unable to connect to Anthropic API

Fix Claude Code ECONNRESET errors when connecting to the Anthropic API Includes evidence for Claude Code troubleshooting demand.

Source-backed Last updated May 11, 2026 1 source Needs local verification

Category: AI Coding Tools
Error signature: Unable to connect to API (ECONNRESET)
Quick fix: Compare the failing environment with a known working setup, then change one configuration value at a time.
Updated: May 11, 2026
Verification status: Source-backed
Evidence: 1 public source URL

Before you change production

This page includes public source URLs in the imported troubleshooting record. Compare those references with your version and environment before applying changes.

Reproduce the smallest failing action and save non-secret logs before changing configuration.
Check versions for Claude Code, related SDKs, package managers, CI runners, and hosting providers.
Change one setting or dependency at a time, then rerun the same failing command or request.
Avoid destructive commands, credential rotation, billing changes, or security relaxations without a rollback plan.

What this error means

Unable to connect to API (ECONNRESET) is a Claude Code failure pattern reported for developers trying to fix claude code econnreset errors when connecting to the anthropic api. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

GitHub issue #13657 on anthropics/claude-code (28 comments, closed) reports ECONNRESET on macOS with Opus 4.5. User confirmed DNS/TCP/TLS/HTTP2 all functional, pointing to a transient upstream or client-side connection handling bug. VS Code extension also reports 'Failed to export telemetry events' errors simultaneously.

Common causes

Claude Code users experience sudden ECONNRESET failures despite healthy network connectivity — DNS, TCP, TLS, and HTTP/2 all working. The error appears in both CLI (Unable to connect to API (ECONNRESET)) and VS Code extension telemetry, making the tool completely unusable until the issue resolves.
GitHub issue #13657 on anthropics/claude-code (28 comments, closed) reports ECONNRESET on macOS with Opus 4.5. User confirmed DNS/TCP/TLS/HTTP2 all functional, pointing to a transient upstream or client-side connection handling bug. VS Code extension also reports 'Failed to export telemetry events' errors simultaneously.

Quick fixes

Confirm the exact error signature matches Unable to connect to API (ECONNRESET).
Check the Claude Code account, local tool state, and provider configuration involved in the failing workflow.
Compare the failing environment with a known working setup, then change one configuration value at a time.

Platform/tool-specific checks

Verify the command, editor, extension, or API client that produced the error.
Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

Capture the exact error message and the command, editor action, or request that triggered it.
Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
Review the source evidence below and compare it with your environment.
Apply one change at a time and rerun the smallest failing action.
Keep the working fix documented for the team or deployment environment.

How to prevent it

Keep provider/tool configuration documented.
Record non-secret diagnostics such as tool version, provider name, model name, and command path.
Add a lightweight check before CI or production workflows depend on the tool.

Diagnostic flow for this page

Match Unable to connect to API (ECONNRESET) exactly before applying the quick fix.
Compare the failing environment with Claude Code versions, account scope, provider settings, and deployment context.
Check the listed common causes in order, starting with the cause that best matches your logs.
Use the evidence status below to decide whether to confirm against public sources or official documentation.
Apply one reversible change, rerun the smallest failing action, and keep rollback notes.

FAQ

What does Unable to connect to API (ECONNRESET) mean in Claude Code?

Unable to connect to API (ECONNRESET) indicates the workflow described by "Claude Code ECONNRESET — Unable to connect to Anthropic API" failed in a AI Coding Tools context. Start by confirming the exact signature and the component that emitted it.

What should I check first for Unable to connect to API (ECONNRESET)?

Check whether this cause matches your environment: Claude Code users experience sudden ECONNRESET failures despite healthy network connectivity — DNS, TCP, TLS, and HTTP/2 all working. The error appears in both CLI (Unable to connect to API (ECONNRESET)) and VS Code extension telemetry, making the tool completely unusable until the issue resolves.

Is the Unable to connect to API (ECONNRESET) guidance source-backed?

The "Claude Code ECONNRESET — Unable to connect to Anthropic API" page is labeled source-backed. It has 1 public source URL from github.com, so use that evidence status when deciding how much additional verification you need.

When should I avoid the quick fix for Unable to connect to API (ECONNRESET)?

For "Claude Code ECONNRESET — Unable to connect to Anthropic API", avoid applying "Compare the failing environment with a known working setup, then change one configuration value at a time." when the error text differs, the affected version or provider is different, or the change would touch credentials, billing, DNS, production deploy settings, or irreversible data.

What should I collect before debugging Unable to connect to API (ECONNRESET)?

For "Claude Code ECONNRESET — Unable to connect to Anthropic API", collect the failing Claude Code command or request, non-secret configuration, versions, timestamps, request IDs when available, and the smallest reproduction that still triggers the signature.