Claude API Connection Errors: Troubleshoot and Test Connectivity
⚡ TL;DR Most connection errors come from your firewall, network or VPN. Allow the API, disable VPNs, then send a test request with your key and check the status code and body.
Requests failing before they reach Claude? Claude API connection errors are usually local.
Troubleshooting guide. 🌐
🌐 Common Causes of Claude API Connection Errors
Your own setup: a firewall, network restriction or VPN.
🛠️ Fixes
Steps:
🧱 Check firewall rules and allow the Claude API
🔌 Disable any VPN and retry
🙋 Contact Support if it persists
🧪 Test Connectivity
Create an API key, send a test request using the Getting started example, and check the status code, response body and any error message.
💡 Pro tip Test from a different network to quickly confirm whether the issue is local.
🙋 Getting Help
Use the Help Center message icon or Get help in your Console menu.
Most Claude API connection errors take minutes to fix. Need help with network setup for AI? Lord Of The Wix can assist. ✨
❓ Claude API connection errors FAQ
What causes API connection errors?
Usually a firewall, network restriction or VPN.
Should I disable my VPN?
Yes, before retrying.
How do I test connectivity?
Send a test request with your API key.
What should I check in the response?
Status code, body and error messages.
What if it still fails?
Contact Support.
🙏 Credit: This article is based on public information from the Claude Help Center. Claude is a product of Anthropic. Source: support.claude.com.
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