ssh_exchange_identification Connection closed by remote host

The error message "ssh_exchange_identification: Connection closed by remote host" occurs when the SSH connection is terminated by the remote host before the identification process is completed.

There could be several reasons for this error:

1. Network connectivity issues: The remote host or the network connection between your client and the remote host may be experiencing connectivity problems. Check your internet connection and try again.

2. Firewall or security settings: The remote host may have firewall rules or security settings that are blocking your connection. Contact the system administrator of the remote host to verify if any restrictions are in place.

3. SSH server configuration: The SSH server on the remote host may be misconfigured or experiencing issues. Verify the SSH server configuration and check the server logs for any error messages.

4. Incorrect SSH client configuration: Check your SSH client configuration to ensure that it is correctly set up to connect to the remote host. Verify the hostname, port, and authentication settings.

If you are unable to resolve the issue, you can try the following troubleshooting steps:

• Restart your local SSH client and try connecting again.
• Try connecting from a different network or machine to rule out any local network issues.
• Verify if other users can successfully connect to the remote host using SSH.
• Consult the system administrator of the remote host for further assistance.

Note that if you are trying to connect to a remote host that you do not have authorized access to, the remote host may intentionally close the connection to prevent unauthorized access