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What is the problem if the website refreshes 502 after ten seconds? The server configuration is very high.

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Release： 2016-10-10 11:39:08
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CPU: 2 cores, Memory: 8192 MB, Bandwidth 10Mbps
Open the homepage of the website, hold down f5, keep refreshing and then get 502. Mysql is used on the external network, and mysql does not hang.
The other one has 2 cores, 2048 memory, and 2m bandwidth. I have never used lnmp, and the refresh will not kill it.
Has anyone encountered the same problem? Please give me some advice

ps: The environment that dies as soon as it is refreshed uses the lnmp installation package

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