Why Am I Getting an 'Unknown Server' Exception with Paramiko, and How Can I Fix It?

Error: Paramiko "Unknown Server" Exception

When attempting to initiate a connection using the Paramiko library, users may encounter an "Unknown Server" exception. This occurs regardless of the target server address.

Resolution:

To resolve this issue, adjust the host key verification policy:

1. Import the paramiko library:

   import paramiko

2. Create an SSH client instance:

   client = paramiko.SSHClient()

3. Use set_missing_host_key_policy() to set the policy for handling unknown hosts:

   client.set_missing_host_key_policy(paramiko.AutoAddPolicy())

4. Attempt to connect securely to the target server:

   client.connect('127.0.0.1', username=username, password=password)

5. Optionally, execute commands:

   stdin, stdout, stderr = client.exec_command('ls -l')

This policy allows you to automatically add unknown host keys to the system's SSH configuration for future reference.

Additional Tips:

• Save the host key to a file for later use:

  ssh.get_host_keys().save('/some/file/path')

• Load the host key from a file for future connections:

  ssh.load_host_keys('/some/file/path')

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