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domain	haoyisheng.com
summary	The message "502 Bad Gateway" indicates that there is a problem with the communication between servers. Specifically, when using Nginx powered by Tengine as an intermediary (reverse proxy), it received invalid or unexpected responses from upstream server(s). This error often results in web requests not being properly handled and can cause website accessibility issues for users. Possible reasons behind this issue may include: 1. Upstream Server Failure: The backend server that is supposed to provide content might be down, overloaded with traffic, experiencing network problems, etc., which causes Nginx (acting as a gateway) unable to retrieve the expected response. 2. Configuration Issues in Tengine or Nginx: Misconfiguration of either software component could result in improper handling and forwarding requests between servers leading up to this error message being generated. To troubleshoot: 1. Check if upstream server(s) are reachable, responsive (no downtime), with adequate resources available for processing incoming web traffic. 2. Verify the configuration files (.conf files) associated both Nginx and Tengine components: Ensure correct proxy settings, port numbers/addresses of servers to communicate between them as well as other related parameters like timeout values etc., which might be leading up this error message being generated. Resolving such an issue involves diagnosing upstream server(s), correcting configuration errors in software (Nginx powered by Tengine) and ensuring seamless communication flow for successful web request handling.
title	502 Bad Gateway
description	502 Bad Gateway
keywords	gateway
upstreams
downstreams
nslookup	A 123.56.218.0
created	2025-06-21
updated	2025-06-21
summarized	2025-06-21

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