Xvnc - an X server providing VNC connectivity

       Original  VNC  was  developed  in  AT&T  Laboratories  Cambridge.  TightVNC additions were implemented by
       Constantin Kaplinsky. Many other people participated in development, testing and support.

       Manpageauthors:
       Marcus Brinkmann <Marcus.Brinkmann@ruhr-uni-bochum.de>,
       Tim Waugh <twaugh@redhat.com>,
       Constantin Kaplinsky <const@tightvnc.com>

                                                   August 2006                                           Xvnc(1)

       There  are  many  security  problems in current Xvnc implementation. It's recommended to restrict network
       access to Xvnc servers from untrusted network addresses. Probably, the best way to secure Xvnc server  is
       to  allow  only  loopback  connections  from  the  server  machine (the -localhost option) and to use SSH
       tunneling  for  remote   access   to   the   Xvnc   server.   For   details   on   SSH   tunneling,   see
       <URL:http://www.cl.cam.ac.uk/Research/DTG/attarchive/vnc/sshvnc.html> .

Xvnc  is  a  VNC (Virtual Network Computing) server. It acts like an X server with a virtual display. The
       display can be seen by a VNC viewer application, which  may  be  running  on  a  different  machine:  see
       vncviewer(1). Xvnc is built inside the source code tree of XFree86, and shares many options with it.

       Normally, you don't need to start Xvnc manually; use the vncserver(1) wrapper script instead. This script
       sets reasonable defaults for Xvnc session, checks many error conditions etc.

       Please read the BUGS section if you plan to use VNC on an untrusted network.

       Xvnc - an X server providing VNC connectivity

       Xvnc supports many standard X server options and a number of VNC-specific options. To see what standard X
       server  options  are  supported, please look at the Xvnc-help output and read the Xserver(1) manual page
       for details on those options.

       The VNC-specific options are as follows:

       -geometrywidthxheight
              Set desktop width and height.

       -depthdepth
              Set the colour depth of the visual to provide, in bits per pixel. Must be a value  between  8  and
              32.

       -pixelformatrgbNNN|bgrNNN
              Set  colour  format for pixels representation. The viewer can do the conversion to any other pixel
              format, but it is faster if the depth and pixel format of the server is the same as the equivalent
              values on the viewer display.

       -udpinputportport
              UDP port for keyboard/pointer data.

       -rfbportport
              TCP port for RFB protocol. The RFB protocol is used  for  communication  between  VNC  server  and
              clients.

       -rfbwaittime
              Maximum time, in milliseconds, to wait for an RFB client (VNC viewer).

       -nocursor
              Don't put up a pointer cursor on the desktop.

       -rfbauthpasswd-file
              Use  authentication  on RFB protocol from the specified file. The passwd-file can be created using
              the vncpasswd(1) utility.

       -httpddir
              Serve files via HTTP protocol from the specified directory.  Normally,  Java  viewer  classes  are
              stored in such directory.

       -httpportport
              TCP port on which Xvnc should listen for incoming HTTP connections (to allow access to the desktop
              from any Java-capable browser).

       -deferupdatetime
              Time  in  milliseconds,  to defer screen updates (default 40). Deferring updates helps to coalesce
              many small desktop changes into a few larger updates thus saving network bandwidth.

       -economictranslate
              Use less memory-hungry pixel format translation.

       -lazytight
              Disable the "gradient" filter in Tight encoding (TightVNC-specific).  The "gradient" filter  often
              helps  to  improve  data compression ratios, but may slow down the server performance. Please note
              that this filter is never used when a client enables JPEG compression in the Tight encoding.

       -desktopname
              Set VNC desktop name ("x11" by default).

       -alwaysshared
              Always treat new clients as shared, never disconnect existing client on a new client connection.

       -nevershared
              Never treat new clients as shared, do not allow several simultaneous client connections.

       -dontdisconnect
              Don't disconnect existing clients when a new non-shared connection comes in, refuse new connection
              instead.

       -viewonly
              Don't accept keboard and pointer events from clients. All clients will be able to see the  desktop
              but won't be able to control it.

       -localhost
              Only  allow  loopback  connections  from  localhost. This option is useful in conjunction with SSH
              tunneling.

       -interfaceipaddr
              Listen for client connections only on the network interface with given ipaddr.

       -inetd Xvnc is  launched  by  inetd.  This  option  causes  Xvnc  to  redirect  network  input/output  to
              stdin/stdout.

       -compatiblekbd
              Set META and ALT keys to the same X modifier flag, as in the original version of Xvnc by AT&T labs
              (TightVNC-specific).

vncserver(1), vncviewer(1), vncpasswd(1), vncconnect(1), sshd(1)

Xvnc   [:display]  [-geometry  widthxheight]  [-depth  depth] [-pixelformat rgbNNN|bgrNNN] [-udpinputport
              port] [-rfbport port] [-rfbwait time] [-nocursor] [-rfbauth passwd-file] [-httpd  dir]  [-httpport
              port]  [-deferupdate  time]  [-economictranslate]  [-lazytight]  [-desktop  name]  [-alwaysshared]
              [-nevershared]   [-dontdisconnect]   [-viewonly]   [-localhost]   [-interface   ipaddr]   [-inetd]
              [-compatiblekbd] [X-options...]