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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