Solution to Ubuntu and CentOS Plesk 502 Error

We check system errors with the following command.

journalctl -xe

Type the following values ​​into the http{} range in the Nginx settings file.

nano /etc/nginx/nginx.conf

error_log /var/log/nginx/error.log;
error_log /var/log/nginx/error.log notice;
error_log /var/log/nginx/error.log info;
proxy_buffer_size 256k;
proxy_buffers 4 512k;
proxy_busy_buffers_size 512k;

We restart Nginx.

service nginx restart

We check the nignx status with the following command.

systemctl status nginx.service

for Plesk

To Activate Reverse Proxy Server:

/usr/local/psa/admin/sbin/nginxmng -e

To Disable Reverse Proxy Server:

/usr/local/psa/admin/sbin/nginxmng -d

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