How can I resolve the "Connection refused" error when attempting to SSH into a control plane node for Grafana?

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There could be several reasons why you're seeing the "Connection refused" error when attempting to SSH into a control plane node for Grafana. Here are some possible solutions:

1. Check if the SSH service is running on the control plane node. You can do this by running the following command:

   systemctl status sshd
   

   If the SSH service is not running, start it using the following command:

   systemctl start sshd
   

2. Make sure that the SSH port (default port 22) is open on the control plane node. You can check this by running the following command:

   sudo ufw status
   

   If the firewall is blocking port 22, you can allow incoming SSH connections by running the following command:

   sudo ufw allow ssh
   

3. Check if the SSH configuration on the control plane node is correct. You can do this by checking the contents of the /etc/ssh/sshd_config file. Make sure that the following lines are present and uncommented:

   Port 22
   PermitRootLogin no
   PasswordAuthentication no
   

4. Verify that the IP address of the control plane node is correct. You can do this by running the following command on the machine you're attempting to SSH from:

   ping <IP address of the control plane node>
   

   If the ping fails, there could be a network connectivity issue.

5. Verify that you have the correct login credentials for the control plane node.

If none of the above solutions work, you may need to troubleshoot further or seek assistance from a system administrator.