all domains at my WHM giving ERR_CONNECTION_RESET

Hello, @pietroestrada

Could you please make sure that your web server (Apache or Nginx) is up and running? You can check this either from WHM or via the command line:

In WHM just navigate to Server Status --> Service Status and then you can check if httpd is up and running.

Via the command line you can check the following using netstat :

netstat -plunta | grep httpd

and if you’re runnign nginx

netstat -plunta | grep nginx

Additionally you can check the status of both services using systemctl :

systemctl status httpd

and for nginx

systemctl status nginx

If you do not receive any output you can try restarting the services:

systemctl restart httpd

or

systemctl restart httpd

Also if you’re running PHP-FPM restart this one as well:

/scripts/restartsrv_apache_php_fpm

This should help you to resolve the issue if the web server of PHP-FPM is having issues with the pools. Please let me know how it goes.

Hope this helps!

Regards, Alex