Linux Error - No suitable authentication method found to complete authentication (publickey, keyboard-interactive).

Overview

When attempting to connect to Linux hosts, you may see one of the following errors in the Cloudamize ADC logs or ADC UI

• SshAuthenticationException = No suitable authentication method found to complete authentication (publickey,keyboard-interactive)

• SshAuthenticationException = No suitable authentication method found to complete authentication (publickey,gssapi-keyex,gssapi-with-mic,keyboard-interactive)

Root Cause

Cloudamize ADC connects to Linux servers via SSH using Password Authentication only. It does not currently support publickey (SSH keys), gssapi, or keyboard-interactive methods. These errors indicate that the target Linux server is configured to prioritize or exclusively allow these unsupported methods, causing the ADC's password-based connection attempt to be rejected.

Troubleshooting Steps

Option 1: Enable Password Authentication (Recommended for Agentless)

You must modify the SSH daemon configuration on the target Linux server to allow password-based logins.

1. Log in to the remote Linux server as a user with sudo or root privileges.

2. Open the SSH configuration file (usually located at /etc/ssh/sshd_config) using a text editor:

   sudo vi /etc/ssh/sshd_config

3. Locate the line PasswordAuthentication.

4. Change the value from no to yes:

   PasswordAuthentication yes

5. Save the file and exit the editor.

6. Restart the SSH daemon to apply the changes
   

Option 2: Use the Cloudamize Agent (Alternative)

If your organization cannot or will not enable Password Authentication due to security policies:

• Install the Cloudamize Agent locally on the Linux server.

• The Agent runs as a local service and does not require remote SSH authentication to collect data, bypassing the need for any SSH configuration changes.

• You can find the Linux Agent installation instruction KB here.
  

Always ensure that any changes to /etc/ssh/sshd_config comply with your organization's security standards before implementation.

If the issue persists, please capture a screenshot of the error output and collect the log_backup.txt file from the following directory on the Cloudamize Agentless DC:

C:\Program Files (x86)\CloudamizeAgentlessDc\log_backup.txt

Please attach both the screenshot and the log file in an email to helpdesk@cloudamize.com for further investigation.