This happens because Nginx meets the open files limit. This is a well-known issue of the server environment. To resolve it, you need to make additional changes into the Nginx config in systemd:
1) mkdir -p /etc/systemd/system/nginx.service.d
2) echo -e "[Service]\nLimitNOFILE=16384" >> /etc/systemd/system/nginx.service.d/nofile.conf
3) systemctl daemon-reload
4) systemctl restart nginx.service
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