Recently, I configured Nginx + PHP FPM using VestaCP on my cloud server. After configuring DNS and all other basic stuff, I deployed a CodeIgniter project on my domain. Deployment was successful but whenever I tried to hit the domain it gave me 404 error. After a lot of searching I found the solution.

• Log in to your server via SSH
• Open Nginx configuration file for your domain

 sudo nano /home/<username>/conf/web/<domain-address>.nginx.conf

• Add the following code in conf file

location / {
try_files $uri $uri/ /index.php; //add this line
}

• Validate configuration file by running this command

sudo nginx -t

• At the end, restart Nginx service

 sudo systemctl reload nginx