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Bishakh Ghosh
Bishakh Ghosh

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Facing 502 Bad Gateway? These might be the reasons.

Understanding the 502 Bad Gateway Error

A 502 Bad Gateway error occurs when a reverse proxy server fails to get a valid response from the upstream server (usually the main web server). This prevents the proxy from forwarding the client’s request, resulting in the error.

Common Causes

  • Upstream server issues: Downtime, failure, or overload.
  • Reverse proxy misconfiguration.
  • DNS problems: Incorrect resolution of the upstream server’s IP address.
  • CDN or cache-related issues.

Solutions

For Website Visitors:

  • Refresh the page.
  • Clear your browser’s cache and cookies.
  • Switch to a different browser or device.

For Website Administrators/Developers:

  • Review reverse proxy logs for errors.
  • Check the upstream server’s health and resource usage.
  • Restart the reverse proxy and upstream server.
  • Verify DNS configurations for recent changes.
  • Investigate CDN status or caching layers.

More detailed explaination and troubleshooting advice can be found here: https://pinggy.io/blog/502_bad_gateway_meaning/

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