Opening the terminal shows Connecting.. Error connecting to backend.. Connection Closed

I am trying to open the terminal in my admin panel, but when i do it it shows

Connecting…
Error connecting to backend.
Connection Closed

I tried rebot SSH server but that wont fix the issue for me

Same issue. Has anyone solved it?

Are you using ip to access or hostname with SSL?

I have faced this issue after rebooting the server using reboot command

Connecting...                                                                                                           
Error connecting to backend.                                                                                            
                                                                                                                        
connection closed .

Same problem, I am using IP and custom ssh port. But even with default 22 still error.
Firewall was open ssh port.

root@cyberpanel:/# ps aux | grep CPWeb
root 13530 0.0 3.0 53244 32268 ? S 11:50 0:00 /usr/local/CyberCP/bin/python /usr/local/CyberCP/WebTerminal/CPWebSocket.py
root 13629 0.0 0.0 6432 724 pts/1 S+ 11:51 0:00 grep --color=auto CPWeb
root@cyberpanel:/#