1. Launch the terminal application on your computer:
   • Windows 10: Windows PowerShell (Do not launch it using "Run as administrator".)
   • macOS: Terminal.app
2. Run the command ssh-keygen -t rsa.
3. Enter the path where you want to save the RSA key, e.g., "/Users/jay/.ssh/id_rsa". Hitting the Enter key to use the default path.
4. Enter a passphrase for the private key when prompted. You can also skip it by hitting the Enter key twice if you don't want to enter a passphrase whenever you use the key.
5. Get the public key id_rsa.pub and the private key id_rsa from the path you previously specified. When migrating the private key to another device, make sure to use encrypted transfer via HTTPS, FTPS, or SFTP to prevent key leakage.¹

1. Download and install PuTTY on your computer.
2. Launch PuTTY Key Generator (PuTTYgen).
3. Click Generate to generate an RSA key.
4. (Optional) Enter a passphrase for the private key in the Key passphrase and Confirm passphrase fields. You'll have to enter it whenever you use the key.
5. Copy and save the text displayed in the red box as a .txt file, and name it as id_rsa.pub.
6. Click Save private key and name the file as id_rsa.ppk.

1. Sign in to DSM as an administrator.
2. Go to DSM File Station > home.
3. Create an sub-folder named .ssh.
4. Upload the public key id_rsa.pub to the .ssh folder.

Go to DSM File Station and upload the public key id_rsa.pub to a shared folder, e.g., a shared folder named test.

Sign in as an administrator

1. Sign in to DSM as an administrator via SSH (refer to this article for detailed instructions, but do not run sudo -i).
2. Run a cd command to switch to the .ssh folder you previously created.
   cd ~/.ssh
3. Append the public key to a new file by running the command below. There will be two files in the .ssh folder: authorized_keys and id_rsa.pub.
   cat id_rsa.pub >> authorized_keys
4. The setup is complete after the steps above. You can now sign in to your DSM via SSH using a specified administrator account without entering its password:²

   Command	Example
   ssh DSM admin account@DSM IP address -p SSH port number	ssh myadmin@10.17.28.75 -p 22

   

Sign in as root

1. Sign in to DSM with root privilege via SSH (refer to this article for detailed instructions).
2. Run the following command to create a folder named .ssh.
   mkdir -p /root/.ssh
3. Copy the public key to a new file by running the command below.
   cp /volumeX3/test/id_rsa.pub /root/.ssh/authorized_keys
4. Run the following command to ensure that everything in the .ssh folder can only be accessed by the root account.
   chmod 700 -R ~/.ssh
5. Run the following command to ensure the permissions of the .ssh folder and the authorized_keys file are "700", which is equivalent to "rwx------".
   ll -R /root | grep 'ssh\|auth'
   
6. Please also make sure the owner and group of authorized_keys is "root". If not, run the following command to edit the permission.
   chown root:root /root/.ssh/authorized_keys
   
7. The setup is complete after the steps above. You can now sign in to your DSM via SSH as root without entering its password:²

   Command	Example
   ssh root@DSM IP address -p SSH port number	ssh root@10.17.28.75 -p 22

   

Sign in as an administrator

1. Launch PuTTY on your computer.
2. Sign in to DSM as an administrator via SSH (refer to this article for detailed instructions, but do not run sudo -i).
3. Run a cd command to switch to the .ssh folder you previously created.
   cd ~/.ssh
4. Append the public key to a new file by running the command below. There will be two files in the .ssh folder: authorized_keys and id_rsa.pub.
   cat id_rsa.pub >> authorized_keys
5. End the current session and launch PuTTY again.
6. At the Session page, enter "DSM admin account@DSM IP address" in the Host Name (or IP address) field, e.g., "bwdsm6@10.17.28.75".
7. Enter the SSH port of your DSM in the Port field, e.g., 22.
8. Go to Connection > SSH > Auth. Click Browse to upload your private key file for authentication.
9. Click Open.
10. The setup is complete after the steps above. You can now sign in to your DSM via SSH using a specified administrator account without entering its password.

Sign in as root

1. Launch PuTTY on your computer.
2. Sign in to DSM with root privilege via SSH (refer to this article for detailed instructions).
3. Run the following command to create a folder named .ssh.
   mkdir -p /root/.ssh
4. Copy the public key to a new file by running the command below.
   cp /volumeX3/test/id_rsa.pub /root/.ssh/authorized_keys
5. Run the following command to ensure that everything in the .ssh folder can only be accessed by the root account.
   chmod 700 -R ~/.ssh
6. Run the following command to ensure the permissions of the .ssh folder and the authorized_keys file are "700", which is equivalent to "rwx------".
   ll -R /root | grep 'ssh\|auth'
   
7. Please also make sure the owner and group of authorized_keys is "root". If not, run the following command to edit the permission.
   chown root:root /root/.ssh/authorized_keys
   
8. End the current session and launch PuTTY again.
9. At the Session page, enter "root@DSM IP address" in the Host Name (or IP address) field, e.g., "root@10.17.28.75".
10. Enter the SSH port of your DSM in the Port field, e.g., 22.
11. Go to Connection > SSH > Auth. Click Browse to upload your private key file for authentication.
12. Click Open.
13. The setup is complete after the steps above. You can now sign in to your DSM via SSH as root without entering its password.