Nginx port CSF Firewall
NGINX Installation on WHM 100

Normally you do not need to make any changes to the firewall when nginx is installed in a rever-proxy configuration. The installation will change the Apache ports if they are set to the defaults of 80 and 443, but since the traffic to Apache is only handled internally on the server, nothing else needs to be opened externally - all that communication is just between nginx and Apache.

It change the Apache ports on the backend, and immediately starts handling all the traffic.
If you don't like it or see issues, uninstalling the package removes the changes and you're back to how you were.

:
https://forums.cpanel.net/threads/ng...whm-96.690353/