the firewall block all access

When it activates the firewall it blocks all access to the server (ssh, http, mail etc) by any ip.
Only my ip has access to the server, everything else is blocked including who accesses the sites.

There is no ip on the black list.

You probably confuse CSF and the firewall which is provided by hosting provider.
the CSF from CWP does not block access to well-known ports (80,25...)

Mostly all cloud hosting providers nowaday provide firewall and in this case you need to setup Security Group to open ports