Vnc Client On For Tightvnc

1. Vnc Client Tightvnc
2. Vnc Viewer For Tightvnc
3. Vnc Client Ubuntu Tightvnc

TigerVNC is an implementation of the Virtual Network Computing (VNC) protocol. This article focuses on the server functionality.

Installation

TightVNC is an improved version of VNC, great free remote-desktop tool. The improvements include bandwidth-friendly 'Tight' encoding, file transfers in the Windows version, enhanced GUI, many bugfixes, and more. What Is TightVNC? VNC (an abbreviation for Virtual Network Computing) is a great client/server software package allowing remote network access to graphical desktops. With VNC, you can access your machine from everywhere provided that your machine is connected to the Inte. All these parameters are necessary for VNC connection. Connecting using TightVNC Viewer. If you have installed TightVNC, then open TightVNC Viewer. In the Remote Host field enter the IP address for VNC connection and, after two colons (::), the port and then press Connect. In the next window enter the password and press OK.

Install the tigervnc package.

Running vncserver for virtual (headless) sessions

Initial setup

For a quick start, see the steps below. Users are encouraged to read the vncserver man page for the complete list of configuration options.

1. Create a password using vncpasswd which will store the hashed password in ~/.vnc/passwd.
2. Edit /etc/tigervnc/vncserver.users to define user mappings. Each user defined in this file will have a corresponding port on which its session will run. The number in the file corresponds to a TCP port. By default, :1 is TCP port 5901 (5900+1). If another parallel server is needed, a second instance can then run on the next highest, free port, i.e 5902 (5900+2).
3. Create ~/.vnc/config and at a minimum, define the type of session desired with a line like session=foo where foo corresponds to which ever DE is to run. One can see which DEs are available on the system by seeing their corresponding .desktop files within /usr/share/xsessions/.

For example:

Starting and stopping tigervnc

Startvncserver@.service and optionally enable it to run at boot time/shutdown. Note that the display number needs to be specified following the literal @ sign. For :1 it would look like this:

Expose the local display directly

Tigervnc comes with libvnc.so which can be directly loaded during X initialization which provides better performance.Create a following file and restart X:

Running x0vncserver to directly control the local display

tigervnc also provides x0vncserver which allows direct control over a physical X session. After defining a session password using the vncpasswd tool, invoke the server like so:

For more information, see x0vncserver(1).

• x11vnc is an alternative VNC server which can also provide direct control of the current X session.
• x0vncserver does not currently support clipboard sharing between the client and the server (even with the help of autocutsel). See: Issue #529.

Starting x0vncserver via xprofile

A simple way to start x0vncserver is adding a line in one of the xprofile files such as:

Starting and stopping x0vncserver via systemd

In order to have a VNC Server running x0vncserver, which is the easiest way for most users to quickly have remote access to the current desktop, create a systemd unit as follows replacing the user and the options with the desired ones:

Start and enable the service x0vncserver.service in Systemd/User mode, i.e. with the --user parameter.

Running Xvnc with XDMCP for on demand sessions

One can use systemd socket activation in combination with XDMCP to automatically spawn VNC servers for each user who attempts to login, so there is no need to set up one server/port per user. This setup uses the display manager to authenticate users and login, so there is no need for VNC passwords. The downside is that users cannot leave a session running on the server and reconnect to it later.

To get this running, first set up XDMCP and make sure the display manager is running.Then create:

Use systemctl to start and enablexvnc.socket. Now any number of users can get unique desktops by connecting to port 5900.

If the VNC server is exposed to the internet, add the -localhost option to Xvnc in xvnc@.service (note that -query localhost and -localhost are different switches) and follow #Accessing vncserver via SSH tunnels. Since we only select a user after connecting, the VNC server runs as user nobody and uses Xvnc directly instead of the vncserver script, so any options in ~/.vnc are ignored. Optionally, autostartvncconfig so that the clipboard works (vncconfig exits immediately in non-VNC sessions). One way is to create:

Connecting to vncserver

Any number of clients can connect to a vncserver. A simple example is given below where vncserver is running on 10.1.10.2 port 5901, or :1 in shorthand notation:

Passwordless authentication

The -passwd switch allows one to define the location of the server's ~/.vnc/passwd file. It is expected that the user has access to this file on the server through SSH or through physical access. In either case, place that file on the client's file system in a safe location, i.e. one that has read access ONLY to the expected user.

The password can also be provided directly.

Example GUI-based clients

• vncviewer-jar^AUR

TigerVNC's vncviewer also has a simple GUI when run without any parameters:

Accessing vncserver via SSH tunnels

For servers offering SSH connection, an advantage of this method is that it is not necessary to open any other port than the already opened SSH port to the outside, since the VNC traffic is tunneled through the SSH port.

On the server

On the server side, vncserver or x0vncserver must be run.

When running either one of these, it is recommended to use the localhost option in ~/.vnc/config or the -localhost switch (for x0vncserver) since it allows connections from the localhost only and by analogy, only from users ssh'ed and authenticated on the box. For example:

Make sure to Start or Restart the vncserver@.service, for example (see also #Initial setup):

or for x0vncserver:

On the client

The VNC server has been setup on the remote machine to only accept local connections.Now, the client must open a secure shell with the remote machine (10.1.10.2 in this example) and create a tunnel from the client port, for instance 9901, to the remote server 5901 port. For more details on this feature, see OpenSSH#Forwarding other ports and ssh(1).

Once connected via SSH, leave this shell window open since it is acting as the secured tunnel with the server. Alternatively, directly run SSH in the background using the -f option. On the client side, to connect via this encrypted tunnel, point the vncviewer to the forwarded client port on the localhost.

What happens in practice is that the vncviewer connects locally to port 9901 which is tunneled to the server's localhost port 5901. The connection is established to the right port within the secure shell.

What it does is that the -f switch will make ssh go in the background, it will still be alive executing sleep 10. vncviewer is then executed and ssh remains open in the background as long as vncviewer makes use of the tunnel. ssh will close once the tunnel is dropped which is the wanted behavior.

Alternatively, vncviewer's -via switch provides a shortcut for the above command:

(Notice the double colon – vncviewer's syntax is [host]:[display#] or [host]::[port].)

Connecting to a vncserver from Android devices over SSH

To connect to a VNC server over SSH using an Android device as a client, consider having the following setup:

1. SSH running on the server
2. vncserver running on server (with -localhost flag for security)
3. SSH client on the Android device: ConnectBot is a popular choice and will be used in this guide as an example
4. VNC client on the Android device: androidVNC used here

In ConnectBot, connect to the desired machine. Tap the options key, select Port Forwards and add a port:

In androidVNC connect to the VNC port, this is the local address following the SSH connection:

Tips and tricks

Connecting to an OSX system

See https://help.ubuntu.com/community/AppleRemoteDesktop. Tested with Remmina.

Recommended security settings

If not #Accessing vncserver via SSH tunnels where the identification and the encryption are handled via SSH, it is recommended to use X509Vnc, as TLSVnc lacks identity verification.

Issuing x509 certificates is beyond the scope of this guide. However, Let's Encrypt provides an easy way to do so. Alternatively, one can issue certificates using OpenSSL, share the public key with the client and specify it with the -X509CA parameter. An example is given below the server is running on 10.1.10.2:

Toggling fullscreen

This can be done through vnc client's menu. By default, vnc client's mkey is F8.

Vnc Client Tightvnc

Workaround for mouse back and forward buttons not working

The VNC protocol currently only uses 7 mouse buttons (left, middle, right, scroll up, scroll down, scroll left, scroll right) which means if your mouse has a back and a forward button these are not usable and input will be ignored.

evrouter can be used to work around this limitation by sending keyboard key presses when clicking the mouse back/forward buttons. Optionally xte found in xautomation and xbindkeys can be used on the server to map the keyboard key presses back to mouse button clicks if needed.

Substituting mouse back/forward buttons with keyboard keys XF86Back/XF86Forward

This method is simple and suitable if you only need a way to navigate backward/forward while using web browsers or file browsers for example.

Install evrouter^AUR and xautomation on the client. Configure evrouter, see Mouse buttons#evrouter and evrouter man pages for instructions and tips on how to find the correct device name, window name, button names etc. Example config:

Start evrouter on the client. With above configuration keyboard key XF86Back is sent to the VNC server when clicking the back button on the mouse, and XF86Forward is sent when clicking the forward button.

Mapping the keyboard key presses back to mouse button clicks on the server

If needed it's possible to map the keyboard keys back to mouse button clicks on the server. In this case it might be a good idea to use keyboard keys which are never on the client or server. In the example below keyboard keys XF86Launch8/XF86Launch9 are used as mouse buttons 8/9.

Evrouter configuration on the client:

Install xautomation and xbindkeys on the server. Configure xbindkeys to map keyboard keys XF86Launch8/XF86Launch9 to mouse buttons 8/9 with xte.

Start xbindkeys $ xbindkeys -f ~/.xbindkeysrc. The server will now map XF86Launch8/XF86Launch9 to mouse buttons 8/9.

Troubleshooting

Terminals in vncserver start in / (root dir)

This is a known issue introduced upstream. See: https://github.com/TigerVNC/tigervnc/issues/1108

Unable to type '<' character

If pressing < on a remote client emits the > character, try remapping the incoming key [1]^{[dead link 2020-04-03 ⓘ]}:

Black rectangle instead of window

Most probably this is due to the application strictly requiring the composite Xorg extension. For example webkit based app: midori, psi-plus, etc.

Vnc Viewer For Tightvnc

Restart vncserver in this case using something like following:

It looks like Composite extension in VNC will work only with 24bit depth.

No mouse cursor

If no mouse cursor is visible when using x0vncserver, start vncviewer as follows:

Or put DotWhenNoCursor=1 in the tigervnc configuration file, which is at ~/.vnc/default.tigervnc by default.

Copying clipboard content from the remote machine

If copying from the remote machine to the local machine does not work, run autocutsel on the server, as mentioned in [2]:

Now press F8 to display the VNC menu popup, and select Clipboard: local -> remote option.

'Authentication is required to create a color managed device' dialog when launching GNOME 3

A workaround is to create a 'vnc' group and add the gdm user and any other users using vnc to that group.Modify /etc/polkit-1/rules.d/gnome-vnc.rules with the following[3]:

No window decoration / borders / titlebars / cannot move windows around

Start a window manager to fix an empty xterm frame. E.g. on xfce, run `xfwm4 &` in the terminal.

systemd service unit run as user

To start service for example on display 9:

You maybe want to enable this at boot:

Vnc Client Ubuntu Tightvnc

See also