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Author: Humphrey MpairweLast Updated: Thu, Feb 10, 2022
Virtual Network Computing (VNC) is a connection system that allows you to use your local computer, mouse, and keyboard to control a remote server running a graphical desktop environment. VNC makes software installation, file management, and server setup easy since it offers a straightforward point-and-click graphical user interface (GUI).
In this article, you will learn how to install, configure and secure VNC on Debian 11 using Tight VNC.
Install a VNC client on your Local Computer
Depending on your graphical environment flavor, there are several variants like Xfce and KDE, among others to choose from. This tutorial explains how to install the Gnome environment.
Update and upgrade the server packages.
$ sudo apt update $ sudo apt upgrade
Install necessary Gnome fonts:
$ sudo apt install xfonts-100dpi xfonts-100dpi-transcoded xfonts-75dpi xfonts-75dpi-transcoded xfonts-base
$ sudo apt install gnome
Similar to Gnome, several VNC variants are available in Debian repositories. For this article, install Tiger VNC because it's secure and actively maintained.
Install Tiger VNC by running the following command:
$ sudo apt install tigervnc-common tigervnc-standalone-server
Configure VNC with an access password for your account, then create the initial configuration files directory by running the following command:
Enter a strong password to keep your server secure. Also, select
n when prompted to enter a
view-only password since this would limit you from controlling the remote server.
You will require a password to access your desktops. Password: Verify: Would you like to enter a view-only password (y/n)? n
Once configured, Your output will be similar to the one below:
New 'X' desktop is Example:1 Creating default startup script /home/example/.vnc/xstartup Starting applications specified in /home/example/.vnc/xstartup Log file is /home/example/.vnc/Example:1.log
1represents the display port number, and it's incremented on the service port, instead of 5900, it becomes 5901, representing your account port. If you run the
vncservercommand again, a new port number will be generated.
A new hidden directory
~/.vnc is automatically created, set up a new
xstartup configuration file within the directory to configure Gnome as the default graphical environment.
But first, stop the current VNC instance.
$ vncserver -kill :1
Then, using your favorite editor, create and edit the file
$ nano ~/.vnc/xstartup
Paste the following lines of code:
#!/bin/sh xrdb $HOME/.Xresources vncconfig -iconic & dbus-launch --exit-with-session x-terminal-emulator -depth 32 -geometry 1920x1080 -ls -title "$VNCDESKTOP Desktop" gnome-session
Save and close the file.
execute permissions on the configuration file.
$ chmod +x xstartup
Configure the VNC instance to run as a system service to start, stop, or restart it using systemd management tools instead of manually running
vncserver in your console.
Create a new service file in the
$ sudo nano /etc/systemd/system/vnc.service
Paste the following lines of code:
[Unit] Description=Tiger remote desktop service After=syslog.target network.target [Service] Type=simple User=example PAMName=login PIDFile=/home/%u/.vnc/%H%i.pid ExecStartPre=/bin/sh -c '/usr/bin/vncserver -kill :%i > /dev/null 2>&1 || :' ExecStart=/usr/bin/vncserver -geometry 1920x1080 -localhost :%i ExecStop=/usr/bin/vncserver -kill :%i [Install] WantedBy=multi-user.target
example with your actual username, and set your preferred display resolution next to the
-geometry entry. Finally, save and close the file.
Restart the Systemd daemon.
$ sudo systemctl daemon-reload
Now, enable VNC to start at boot time.
$ sudo systemctl enable firstname.lastname@example.org
Created symlink /email@example.com â /etc/systemd/system/vnc@.service.
1represents the port number of your current VNC instance as displayed in the configuration output earlier.
Next, start the VNC Service.
$ sudo systemctl start vncserver@1
Verify that VNC is up and running by querying the current status.
$ sudo systemctl status vncserver@1
Your output should be similar to the one below:
â firstname.lastname@example.org - Tiger Remote desktop service (VNC) Loaded: loaded (/etc/systemd/system/vnc@.service; enabled; vendor preset: enabled) Active: inactive (dead) since Wed 2022-01-12 17:05:52 UTC; 53s ago Process: 41490 ExecStartPre=/bin/sh -c /usr/bin/vncserver -kill :1 > /dev/null 2>&1 || : (code=exited, status=0/SUCCESS) Process: 41495 ExecStart=/usr/bin/vncserver -geometry 1280x800 -localhost :1 (code=exited, status=0/SUCCESS) Process: 41728 ExecStop=/usr/bin/vncserver -kill :1 (code=exited, status=0/SUCCESS) Main PID: 41495 (code=exited, status=0/SUCCESS) CPU: 26ms Jan 12 17:05:47 Example systemd: Starting TinyVNC Remote desktop service (VNC)... Jan 12 17:05:47 Example systemd: pam_unix(login:session): session opened for user example(uid=1000) by (uid=0) Jan 12 17:05:48 Example systemd: Started TinyVNC Remote desktop service (VNC). Jan 12 17:05:48 Example systemd: pam_unix(login:session): session opened for user example(uid=1000) by (uid=0) Jan 12 17:05:51 Example systemd: pam_unix(login:session): session opened for user example(uid=1000) by (uid=0) Jan 12 17:05:52 Example systemd: email@example.com: Succeeded.
By default, VNC traffic is not encrypted, which presents security risks such as packet sniffing. However, you can securely connect to your server over VNC by adding an SSH encryption layer to the connection.
Depending on your local PC operating system, securely connect to your Debian 11 server over VNC using the following procedures.
Open Terminal, and create an SSH tunnel with the following command:
ssh -L 5901:127.0.0.1:5901 -C -N user@your_server_ip
Lspecifies that SSH connections to the server port
5901have to be forwarded to the specified host (127.0.0.1), and port.
Ccompresses all data.
Ninstructs SSH to strictly forward data with no console window commands.
Your VNC connection will be tunneled through SSH and available on localhost port
5901. Use your VNC client software to make a connection to
127.0.0.1:5901, and start using your remote Debian 11 server desktop.
For the best display quality, change your VNC Viewer picture quality settings from
To securely tunnel your VNC connection on Windows, Install Putty if not already installed, then set up SSH tunneling by navigating to the Session tab.
Establish an SSH connection to the server on port
22, then, in the SSH console window, right-click on the top bar, and select
Change Settings from the options list. Under
Connection expand the SSH option and select
Enter the local source port (5901), then enter your local computer address
127.0.0.1 with VNC remote port
5901, and click
Add to save the SSH forwarding information.
Now, click Open to start SSH forwarding to the localhost port. Open your VNC Viewer and enter address
127.0.0.1:5901 to establish a secure connection to the server. Once connected, your Debian 11 Gnome desktop is displayed.
If you receive the following error after running the command
(process:64512): dconf-CRITICAL **: 11:01:18.406: unable to create directory '/run/user/0/dconf': Permission denied. dconf will not work properly.
Log out of your current user account, then re-login with
su â Username.
You have successfully installed, configured, and securely connected to your VNC server on Debian 11. For every user account you create, a new port number will be created. Use the same above process to securely connect to the server.