Provided by: tigervnc-scraping-server_1.7.0+dfsg-8ubuntu2_amd64 bug


       x0tigervncserver - TigerVNC Server for X displays


       x0tigervncserver [options]
       x0tigervncserver -version


       x0tigervncserver  is  a  TigerVNC Server which makes any X display remotely accessible via
       VNC, TigerVNC or compatible viewers.   Unlike  Xvnc(1),  it  does  not  create  a  virtual
       display.   Instead,  it just shares an existing X server (typically, that one connected to
       the physical screen).

       XDamage will be used if the existing X server supports it. Otherwise x0tigervncserver will
       fall back to polling the screen for changes.


       x0tigervncserver interprets the command line as a list of parameters with optional values.
       Running x0vncserver -h will show a list of all valid parameters with  short  descriptions.
       All parameters are optional, but normally you would have to use the PasswordFile parameter
       (see its description below).

       There are several forms of  specifying  parameters  in  the  command  line  (here  we  use
       `SomeParameter' as an example parameter name):

              Enable  the  parameter, turn the feature on.  This form can be used with parameters
              that simply enable or disable some feature.

              Disable the parameter, turn the feature off.

              Assign the specified value to the parameter.  The leading dash can be  omitted,  or
              it can be doubled if desired (like in GNU-style long options).

       Parameter names are case-insensitive, their order in the command line can be arbitrary.


              The  X  display  name.   If  not specified, it defaults to the value of the DISPLAY
              environment variable.

              TCP port to listen for incoming VNC connections (RFB protocol).  The  default  port
              is 5900.

       Log    Specifies which log output should be directed to which target logger, and the level
              of output to  log.   Format  is  log:target:level.   Default  is  *:stderr:30  (log
              everything  to stderr, set log level to 30).  Log level should be a value between 0
              and 100, higher levels produce more output.

              This parameter allows one to specify a file name with IP access control rules.  The
              file should include one rule per line, and the rule format is one of the following:
              +address/prefix  (accept   connections   from   the   specified   address   group),
              -address/prefix  (reject  connections)  or  ?address/prefix (query the local user).
              The first rule matching the IP address  determines  the  action  to  be  performed.
              Rules  that  include  only  an  action  sign (+, - or ?) will match any IP address.
              Prefix is optional and is specified as a number of bits (e.g. /24).  Default is  to
              accept connections from any IP address.

              Specify  which security scheme to use for incoming connections.  Valid values are a
              comma separated list of None, VncAuth, Plain, TLSNone, TLSVnc, TLSPlain,  X509None,
              X509Vnc and X509Plain. Default is VncAuth,TLSVnc.

       rfbauth, PasswordFile
              Password  file for VNC authentication.  There is no default, you should specify the
              password file explicitly.  Password file should be created  with  the  vncpasswd(1)

              Obfuscated  binary encoding of the password which clients must supply to access the
              server.  Using this parameter is insecure, use PasswordFile parameter instead.

              A comma separated list of user names that are allowed to authenticate  via  any  of
              the  "Plain" security types (Plain, TLSPlain, etc.). Specify * to allow any user to
              authenticate using this security type. Default is to deny all users.

       pam_service, PAMService
              PAM service name to use when authentication users using any of the "Plain" security
              types. Default is vnc.

              Path  to  a  X509  certificate in PEM format to be used for all X509 based security
              types (X509None, X509Vnc, etc.).

              Private key counter part to the certificate given in X509Cert. Must also be in  PEM

              The  number of unauthenticated connection attempts allowed from any individual host
              before that host is black-listed.  Default is 5.

              The initial timeout applied when a host is first black-listed.  The host cannot re-
              attempt a connection until the timeout expires.  Default is 10.

              Prompt the local user to accept or reject incoming connections.  Default is off.

              Number  of  seconds  to  show  the  Accept  Connection  dialog before rejecting the
              connection.  Default is 10.

              Always treat incoming connections as shared,  regardless  of  the  client-specified
              setting.  Default is off.

              Never  treat  incoming  connections  as  shared, regardless of the client-specified
              setting.  Default is off.

              Disconnect existing clients if an incoming connection is non-shared.   If  combined
              with  NeverShared  then  new  connections  will  be refused while there is a client
              active.  Default is on.

              Accept key press and release events from clients.  Default is on.

              Accept pointer events from clients.  Default is on.

              Comma-separated list of incoming keysyms to remap.  Mappings are expressed  as  two
              hex  values,  prefixed  by  0x,  and  separated  by  ->  (`dash' and `greater than'

              Always use RFB protocol version 3.3 for backwards compatibility with  badly-behaved
              clients.  Default is off.

              This  option  specifies  the  screen  area  that will be shown to VNC clients.  The
              format is widthxheight+xoffset+yoffset , where `+' signs can be replaced  with  `-'
              signs  to  specify  offsets  from  the  right and/or from the bottom of the screen.
              Offsets are optional, +0+0 is  assumed  by  default  (top  left  corner).   If  the
              argument is empty, full screen is shown to VNC clients (this is the default).

              Maximum  percentage of CPU time to be consumed when polling the screen.  Default is

              Milliseconds per one polling cycle.  Actual interval may be dynamically adjusted to
              satisfy MaxProcessorUsage setting.  Default is 30.

              x0tigervncserver  uses  a "deferred update" mechanism which enhances performance in
              many cases. After any change to the framebuffer, x0tigervncserver  waits  for  this
              number of milliseconds (default 1) before sending an update to any waiting clients.
              This means that more changes tend to get coalesced together  in  a  single  update.
              Setting   it   to   0  results  in  the  same  behaviour  as  earlier  versions  of
              x0tigervncserver, where the first change to the  framebuffer  causes  an  immediate
              update to any waiting clients.

              Keep  delaying  sending  the screen update to the client(s) each time the screen is
              updated. Otherwise the delay is from the first update. Default is off.

              Perform pixel comparison on framebuffer  to  reduce  unnecessary  updates.  Can  be
              either 0 (off), 1 (always) or 2 (auto). Default is 2.

       UseSHM Use  MIT-SHM  extension if available.  Using that extension accelerates reading the
              screen.  Default is on.

              Use overlay mode in IRIX or Solaris (does not have effect in other systems).   This
              enables  system-specific  access  to complete full-color version of the screen (the
              default X visual often provides 256 colors).  Also, in  overlay  mode,  x0vncserver
              can show correct mouse cursor.  Default is on.

              Zlib  compression  level  for  ZRLE  encoding  (it does not affect Tight encoding).
              Acceptable values are between 0 and 9.  Default is to use the standard  compression
              level provided by the zlib(3) compression library.

              Use  improved  compression  algorithm  for  Hextile  encoding which achieves better
              compression ratios by the cost of using slightly more CPU time.  Default is on.

              The number of seconds after which an idle VNC  connection  will  be  dropped  (zero
              means no timeout).  Default is 0.

              Terminate when no client has been connected for N seconds.  Default is 0.

              Terminate when a client has been connected for N seconds.  Default is 0.

              Terminate after N seconds of user inactivity.  Default is 0.

              The  number  of  milliseconds  to  wait for a client which is no longer responding.
              Default is 20000.

              Currently unused.


       Xtigervnc(1), tigervncpasswd(1),


       Constantin Kaplinsky and others.

       VNC was originally developed by the RealVNC team while at Olivetti  Research  Ltd  /  AT&T
       Laboratories Cambridge.  TightVNC additions were implemented by Constantin Kaplinsky. Many
       other people have since participated in development, testing and support. This  manual  is
       part of the TigerVNC software suite.