Knowledge Center

Terminal

Enabling options at Control Panel > Terminal & SNMP > Terminal allows your Synology Unified Controller to support Telnet and SSH command-line interface services. You can also change the security level of the SSH encryption algorithm.

To enable Telnet/SSH service:

  1. Check the box next to the desired protocol (SSH or Telnet).
  2. Click Apply.

To change SSH service port:

  1. In Port, enter a new port number.
  2. Click Apply.

A variety of encryption algorithms with different security levels are used in securing SSH connections. You can decide which algorithms are used to best meet your needs.

To change the SSH encryption algorithm security level:

  1. Click Advanced Settings.
  2. Select a security level for the encryption algorithms. If you want to specify exactly which algorithms can be used, select Customize to choose from three groups: Cipher, KEX (Key Exchange), and MAC (Message Authentication Code).
  3. Click Apply.

Note:

  • You must enable SSH service at Control Panel > Terminal & SNMP > Terminal to log into DSM UC using SSH.
  • SSH/Telnet only supports logging into the system with accounts belonging to the administrators group. To switch to a root account, please log into the system with SSH/Telnet as a user belonging to the administrators group, run the command sudo -i, and then enter the password of the account used to log in.
  • The password cannot be left blank when logging into the system with SSH/Telnet.
  • When SSH service is disabled, all SSH connections are terminated.
  • Improper manipulation or modification of the Synology Unified Controller may result in malfunctions or loss of data.
  • Selecting a higher security level may cause some SSH clients to be unable to connect due to compatibility issues.