'Ping' is blocked by the Cloudbric policy. Ping is used to check hosting availability and it can result in many malicious actions including DDoS attack.
To test whether a client can access your domain, simply visit your website. It's the proof that both servers run together well. If you want to try to ping specifically, we can make an exception as per your request. To process this, you need to provide us the IP of the server that will be used for the ping.