Provided by: tightvncserver_1.3.10-0ubuntu4_amd64 bug


       Xvnc - an X server providing VNC connectivity


       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-


       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  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:

       -geometry widthxheight
              Set desktop width and height.

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

       -pixelformat rgbNNN|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.

       -udpinputport port
              UDP port for keyboard/pointer data.

       -rfbport port
              TCP port for RFB protocol. The RFB protocol is used for commnunication between  VNC
              server and clients.

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

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

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

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

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

       -deferupdate time
              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.

              Use less memory-hungry pixel format translation.

              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.

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

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

              Never treat new clients  as  shared,  do  not  allow  several  simultaneous  client

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

              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.

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

       -interface ipaddr
              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.

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


       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:> .


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


       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.

       Man page authors:
       Marcus Brinkmann <>,
       Tim Waugh <>,
       Constantin Kaplinsky <>

                                           August 2006                                    Xvnc(1)