Why I am not able to connect Ubuntu server with SSH key?

Question

I have Ubuntu server 22.4 and I it had SSH server installed. Time to time SSH connection was doping even while I was working. I update the SSH by using command sudo apt-get update ssh. After the update, I am not able to connect to my server via SSH.

What I have done so far?

• I restart the Server

• I re-install the ssh

• I switched off the firewall.

• when run ps -ef | grep ssh I see the following result. enter image description here

• sudo systemctl status ssh show active and running.

• I also increase the time for ping to 60 sec and restart the SSH services and server.

• When I use the same static IP it show error of time out as follow.

  Session stopped Press to exit tab Press R to restart session Press S to save terminal output to file Network error: Connection timed out

• When I change the IP address I see this error

  Pinging 153.70.70.70 with 32 bytes of data:
  Reply from 192.123.1.2: Destination host unreachable.
  Reply from 192.123.1.2: Destination host unreachable.
  Reply from 192.123.1.2: Destination host unreachable.
  Reply from 192.123.1.2: Destination host unreachable.
  
  Ping statistics for 153.70.70.70:
      Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
  

Now I have noting left to try and still not able to find the core issue. Please help me out to find, what exactly the problem is and how to resolve it.