How to Login to a Remote Linux Host with RDP Passwordless Using a Private Key

Logging into a remote Linux host using a Remote Desktop Protocol (RDP) passwordless authentication with a private key is a convenient and secure way to access your Linux server. This method eliminates the need to remember and enter a password each time you want to connect to the server. In this article, we will guide you through the process of setting up passwordless login to a remote Linux host using a private key.

Prerequisites

Before we begin, make sure you have the following:

• A remote Linux host with RDP enabled
• A Windows computer with an RDP client installed
• An SSH client installed on your Windows computer

Step 1: Generate SSH Key Pair

The first step is to generate an SSH key pair on your Windows computer. The SSH key pair consists of a public key and a private key. The public key will be added to the remote Linux host, and the private key will be used for authentication from your Windows computer.

1. Open your SSH client on your Windows computer.
2. Run the following command to generate the SSH key pair: ssh-keygen -t rsa -b 4096
3. When prompted, choose a location to save the key pair. You can leave the default location if you prefer.
4. Set a passphrase for your private key. This passphrase adds an extra layer of security to your private key. Make sure to remember this passphrase, as you will need it later.
5. After the key pair is generated, you will have a public key file (usually named id_rsa.pub) and a private key file (usually named id_rsa) in the specified location.

Step 2: Add Public Key to Remote Linux Host

Now that you have generated your SSH key pair, you need to add the public key to the remote Linux host.

1. Connect to the remote Linux host using your SSH client.
2. Once connected, navigate to the ~/.ssh directory on the remote host. If the directory doesn't exist, create it.
3. Open the authorized_keys file in a text editor. If the file doesn't exist, create it.
4. Copy the contents of your public key file (id_rsa.pub) from your Windows computer and paste it into the authorized_keys file on the remote host.
5. Save and close the file.

Step 3: Configure RDP to Use Private Key

Now that your public key is added to the remote Linux host, you need to configure your RDP client to use the private key for authentication.

1. Open your RDP client on your Windows computer.
2. Enter the IP address or hostname of the remote Linux host.
3. Expand the "Show Options" or "Advanced" section, depending on your RDP client.
4. Navigate to the "Advanced" or "Security" tab.
5. Look for an option to specify the private key file or identity file. This option may be labeled differently depending on your RDP client.
6. Browse and select the private key file (id_rsa) you generated earlier.
7. Save the RDP connection settings.

Step 4: Connect to Remote Linux Host

Now that everything is set up, you can connect to the remote Linux host using RDP passwordless authentication.

1. Open your RDP client on your Windows computer.
2. Enter the IP address or hostname of the remote Linux host.
3. Click the "Connect" or "Connect to Server" button.
4. If prompted, enter the passphrase you set for your private key in Step 1.
5. You should now be connected to the remote Linux host without entering a password.

Congratulations! You have successfully logged into a remote Linux host using RDP passwordless authentication with a private key. This method provides a secure and convenient way to access your Linux server without the need to remember and enter a password each time.

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