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Fix Claude Code Connection and Auth Errors

Start with the failure boundary

Claude Code errors become much easier to fix when you identify whether the failure occurs before the request leaves your machine, at the relay, or inside the model request. A DNS error, timeout, or TLS failure is a network problem. A 401 or 403 is usually credentials or account policy. A 404 often means an incorrect base URL or model identifier, while a 429 indicates rate limits, exhausted balance, or temporary capacity pressure.

Run Claude Code with its debug or verbose logging enabled, then inspect the first HTTP status and the request URL. Avoid pasting API keys into issue reports or shell history. If the error is intermittent, record timestamps, region, model ID, and whether the failure happens on every request.

Verify Claude Code environment variables

Claude Code does not authenticate through OpenAI environment variables. For an Anthropic-compatible relay, check the variables in the same terminal session that launches Claude Code:

export ANTHROPIC_BASE_URL=https://api.59api.com

export ANTHROPIC_AUTH_TOKEN=your_59api_key

Some installations use ANTHROPIC_API_KEY instead of ANTHROPIC_AUTH_TOKEN. Use the variable supported by your Claude Code version and provider instructions, not both with conflicting values. Check safely with a masked-length test rather than printing the secret: confirm that the variable exists, is not empty, and has no trailing spaces or quotation marks.

Shell configuration is a frequent trap. A key added to .bashrc will not automatically appear in a zsh, IDE, tmux, Docker, or remote SSH session. After changing variables, open a new terminal or reload the correct profile. Also inspect project-level environment files and process-manager settings for an old ANTHROPIC_BASE_URL overriding your intended value.

Fix base URL and model mismatches

Set the base URL to https://api.59api.com exactly as documented. Do not blindly append /v1: some clients add the API version themselves, and manually adding it can produce a duplicated path such as /v1/v1/messages. Conversely, if your installed client requires a versioned base URL, follow the relay documentation for that client.

A 404 or model-not-found response can also mean that Claude Code is sending a model name the relay does not expose. List or check the model IDs available in your 59API account and use the exact spelling and case. Do not substitute a marketing name for an API identifier, and do not assume that an alias supported by Anthropic is supported by every compatible gateway.

Interpret authentication errors precisely

• 401 Unauthorized: verify the key was copied completely, is active, belongs to the correct account, and is being sent through the selected authentication variable.
• 403 Forbidden: check account permissions, spending limits, model access, geographic policy, or an organization restriction. Reissuing the same key rarely fixes a policy denial.
• 429 Too Many Requests: slow parallel agents, reduce automatic retries, and check balance or quota. Exponential backoff is safer than repeatedly launching Claude Code.
• 400 Bad Request: inspect the model, message format, token limits, and unsupported parameters. This is normally a request-shape problem, not a connectivity problem.

Separate network failures from API failures

Test DNS resolution for api.59api.com, then test HTTPS connectivity through the same VPN, proxy, container, or corporate firewall used by Claude Code. A successful browser visit does not prove that command-line traffic is allowed. Check HTTPS proxy variables, certificate interception, system time, and outbound firewall rules. An incorrect clock can cause TLS certificate validation failures.

If requests work outside Claude Code but fail inside an IDE, compare the IDE's environment with your terminal. Containers may also need explicit DNS and proxy configuration. For repeated timeouts, lower concurrency and test from another network before changing credentials; rotating keys cannot repair a blocked route.

Use a clean, low-cost control test

Temporarily select a smaller available Claude model and make one minimal request. This isolates prompt size, tool permissions, and context-window issues from authentication. 59API is useful for this diagnostic workflow because it offers pay-as-you-go access to native-quality Claude Opus, Sonnet, Haiku, and Fable models without forcing a higher subscription tier. Its OpenAI-compatible access also helps teams reuse existing SDK tooling, while referral rebates can reduce ongoing costs.

Once the control request succeeds, restore your preferred model and tools one at a time. If you want an inexpensive Claude Code-compatible relay, you can sign up for 59API and test the same base URL with a small balance before migrating larger workloads.