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domain	nextra.cn
summary	Here's a summary of the website content regarding a 502 Bad Gateway nginx error: A 502 Bad Gateway error indicates that a server acting as a gateway or proxy received an invalid response from another server upstream. In the context of an nginx web server, this typically means that nginx itself couldn't successfully communicate with the server it was trying to reach (often the application server or backend). Common causes include: * Server Downtime: The backend server might be temporarily unavailable due to maintenance, crashes, or other issues. * Network Problems: Network connectivity issues between nginx and the backend server. * Application Errors: The backend application might be experiencing errors, leading to a failed response. * DNS Issues: Problems resolving the hostname of the backend server. * Nginx Configuration Errors: Incorrect settings in the nginx configuration file could be preventing it from communicating correctly. * Firewall Issues: Firewalls blocking communication. Troubleshooting steps often involve: * Checking the backend server's status. * Verifying network connectivity. * Examining nginx's error logs for more detailed information. * Reviewing the nginx configuration. * Checking DNS settings. Do you want me to elaborate on a specific aspect, such as troubleshooting steps or the nginx configuration?
title	Nextra – Static website generator based on Next.js – Nextra Chinese documentation \| Nextra Chinese website
description	Nextra helps you create beautiful websites using Next.js and MDX.
keywords	gateway
upstreams
downstreams
nslookup	A 59.110.65.123
created	2025-11-06
updated	2026-02-01
summarized	2026-02-02

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