Hello Ajeesh,
It seems that you are performing the ping test for Outbound from C4C. And the error specifies SSL issue. Certificate from C4C must be added on to the middleware (HCI/PI whichever you are using).
In case if it is HCI, this certificate must be used in the Sender Partner in the artifact which you might have deployed on HCI. Since I am not into PI, I cannot comment in case if the middleware is PI.
You can download the certificate for your C4C from the Outbound Communication Setting of the Communication Arrangement.
Hope this helps.
Regards,
Chandan