Anthropic API SSL certificate verification failed via LiteLLM proxy in Kubernetes

What this error means

SSL certificate verification failed for every Anthropic API call — ECONNRESET from vault sidecar intercepting TLS to api.anthropic.com is a Anthropic API failure pattern reported for developers trying to fix anthropic api calls failing with ssl errors when using litellm proxy behind vault sidecar in k8s. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

BerriAI/litellm-agent-platform#102: Vault sidecar gets ECONNRESET forwarding TLS to api.anthropic.com. Claude Code fails with ‘SSL certificate verification failed’ for all Anthropic API calls. Production K8s environment, affects paid Anthropic API users.

Common causes

• BerriAI/litellm-agent-platform#102: Vault sidecar gets ECONNRESET forwarding TLS to api.anthropic.com. Claude Code fails with ‘SSL certificate verification failed’ for all Anthropic API calls. Production K8s environment, affects paid Anthropic API users.

Quick fixes

1. Confirm the exact error signature matches SSL certificate verification failed for every Anthropic API call — ECONNRESET from vault sidecar intercepting TLS to api.anthropic.com.
2. Check the Anthropic API account, local tool state, and provider configuration involved in the failing workflow.
3. 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

1. Capture the exact error message and the command, editor action, or request that triggered it.
2. Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
3. Review the source evidence below and compare it with your environment.
4. Apply one change at a time and rerun the smallest failing action.
5. 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.

Sources checked

• https://github.com/BerriAI/litellm-agent-platform/pull/102

Evidence note: BerriAI/litellm-agent-platform#102: Vault sidecar gets ECONNRESET forwarding TLS to api.anthropic.com. Claude Code fails with ‘SSL certificate verification failed’ for all Anthropic API calls. Production K8s environment, affects paid Anthropic API users.

Related errors

• Anthropic API

FAQ

What should I check first?

Start with the exact SSL certificate verification failed for every Anthropic API call — ECONNRESET from vault sidecar intercepting TLS to api.anthropic.com text and the smallest action that reproduces it.

Can I ignore this error?

No. Treat it as a failed Anthropic API workflow until the root cause is understood.

Is this guaranteed to have one fix?

No. The imported evidence supports the troubleshooting path above, but tool behavior can vary by account, plan, version, provider, and local configuration.

How do I know the fix worked?

Rerun the same command, editor action, or request. The fix is working when that action completes without SSL certificate verification failed for every Anthropic API call — ECONNRESET from vault sidecar intercepting TLS to api.anthropic.com.