You can only connect one GUI server via SSH. This connection will allow you to manage the settings of the GUI server itself. In versions starting from 2.21, the connection is made automatically when installing the GUI. If this does not happen, you can connect it by yourself:

1. Connect to the server (where the GUI is installed) via SSH. Add a sudo user on this hardware. See Sudo user.
2. In the GUI, open the Administrator / Equipment section, add new equipment. Select DPIUI2 Hardware Type. In the IP address field, enter the local address: 127.0.0.1 or localhost. See Add (connect) new server.