502 Bad Gateway nginx 报错（Ubuntu）

502 Bad Gateway nginx 报错（Ubuntu）

/var/log/nginx/error.log

ps -ef grep nginx

csjtl@ubuntu:/etc/nginx/sites-available$ ps -ef grep nginx
root       56043       1  0 10:59 ?        00:00:00 nginx: master process /usr/sbin/nginx -g daemon on; master_process on;
csjtl      56044   56043  0 10:59 ?        00:00:00 nginx: worker process
csjtl      56045   56043  0 10:59 ?        00:00:00 nginx: worker process
csjtl      56046   56043  0 10:59 ?        00:00:00 nginx: worker process
csjtl      56047   56043  0 10:59 ?        00:00:00 nginx: worker process
csjtl      56550   55840  0 11:17 pts/0    00:00:00 grep --color=auto nginx

csjtl@ubuntu:/etc/nginx$ sudo vi nginx.conf 

csjtl@ubuntu:/etc/nginx$ sudo service nginx restart

403 Forbidden nginx/1.17.9 (Ubuntu)

网站服务器汇总：

https://tl8517.com/categories/Build-Personal-Website/UbuntuServer/

参考文档：

https://blog.csdn.net/yishuifengxiao/article/details/80574769