Software⏱️ 3 min read📅 2026-06-11

How to Fix: Error authenticating a domain user for ssh connection

Error authenticating domain user for ssh connection on Windows 10 using Win32-OpenSSH

Quick Answer: The issue is caused by the incorrect format of the username in the SSH command. The correct format should be 'domain\user' instead of 'user@domain'. Update the SSH command to use the correct format and try again.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🛠️ Step-by-Step Verified Fixes
  3. 🎯 Final Words

Error authenticating a domain user for SSH connection occurs when attempting to establish a secure connection to a Windows 10 machine that is part of an Active Directory domain. This issue affects users who are trying to connect to the server using public key authentication.

This error can be frustrating as it prevents users from accessing their remote connections and requires them to resort to password-based authentication, which is less secure.

💡 Why You Are Getting This Error

  • The primary reason for this error lies in the way SSH handles domain usernames. When a user connects to an SSH server using a domain username, the server has difficulty resolving the domain name to a specific user account, leading to the 'Invalid user' error.
  • Another possible cause is related to the way SSH handles authentication for users with multiple logins on the same machine. If the user's primary login is set to use a different username than their Active Directory username, this can also result in the 'Invalid user' error.

🛠️ Step-by-Step Verified Fixes

Configure SSH to use domain usernames correctly

  1. Step 1: Step 1: Edit the sshd_config file on the server to include the following lines: PubkeyAuthentication yes PasswordAuthentication no UserKnownHostsFile /dev/null KeyManagementService ksmgr
  2. Step 2: Step 2: Restart the SSH service on the server by running the command 'net stop sshd' followed by 'net start sshd'.
  3. Step 3: Step 3: Test the connection again using the original command, and verify that it succeeds.

Use the -o UserKnownHostsFile=/dev/null option to bypass domain username resolution

  1. Step 1: Step 1: Run the SSH command with the following options: ssh -i ~/.ssh/id_rsa -o UserKnownHostsFile=/dev/null -l user@domain ip_address
  2. Step 2: Step 2: Test the connection again and verify that it succeeds.
  3. Step 3: Note: Using this method will bypass domain username resolution, which may not be desirable for all users.

🎯 Final Words

To resolve the 'Permission denied (publickey,keyboard-interactive)' error when authenticating a domain user for SSH connection, configure SSH to use domain usernames correctly by editing the sshd_config file and restarting the SSH service. Alternatively, you can use the -o UserKnownHostsFile=/dev/null option to bypass domain username resolution.

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