Server Become unaccessible after Reboot

i Installed cyberpanel on my vps. i rebooted the server but after reboot. i am unable to connect to my server by all way. Nothing works on server. No ssh connect connection, no ip pings.i checked firewall i open all ports try everything but problem not solved. Then i think its my server problem so i try another control panel but that works fine. I tried to install cyberpanel 5 times in my vps but problem remains same.

I like cyberpanel so much i am using it from 2 year. Please tell any solution. I can only access my server by shell console.