python network_error ai_generated true

requests.exceptions.ConnectionError: HTTPConnectionPool(host='nonexistent.example.com', port=80): Max retries exceeded with url: / (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x...>: Failed to establish a new connection: [Errno -2] Name or service not known'))

ID: python/requests-connectionerror-dns-failure

Also available as: JSON · Markdown · 中文
80%Fix Rate
84%Confidence
0Evidence
2024-05-12First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

The hostname cannot be resolved to an IP address because it does not exist or DNS is misconfigured.

generic

中文

主机名无法解析为IP地址，因为它不存在或DNS配置错误。

Workarounds

  1. 90% success Verify the hostname spelling and domain existence 
    Check the URL for typos, e.g., requests.get('https://example.com') instead of 'exampl.com'
  2. 80% success Use a public DNS server like 8.8.8.8 
    Configure system DNS to 8.8.8.8 or use socket.setdefaulttimeout(10) with a custom resolver

Dead Ends

Common approaches that don't work:

  1. Increasing the retry count 95% fail

    Retrying does not fix DNS resolution; the hostname remains unresolved.

  2. Using a VPN or proxy without checking DNS 70% fail

    A VPN may change DNS servers, but if the hostname is invalid, it still fails.