This article explains and records the troubleshooting process in which nginx reports 502 and 504 after migrating the server once, causing the second-level domain name to be inaccessible.
Report 502 Bad Gateway or 504 Gateway Time-out and return the log:
[error] 7#7: *4 connect() failed (110: Connection timed out) while connecting to upstream, client: xx.xx.xx.xx, server: xxx.xubingtao.cn, request: "GET /xxxx/index.html HTTP/1.1", upstream: "http://172.18.0.x:90xxx/xxx/index.html", host: "xxx.xubingtao.cn"
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