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       x0vncserver - TigerVNC Server for X displays

       x0vncserver [options]
       x0vncserver -version

       x0vncserver  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
       x0vncserver will	fall back to polling the screen	for changes.

       x0vncserver  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:tar-
	      get: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 to specify a file name with	IP access con-
	      trol  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	speci-
	      fied as a	number of bits (e.g. /24).  Default is to accept  con-
	      nections 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) utility.

	      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 authen-
	      ticate  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 format.

	      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

	      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' characters).

	      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 35.

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

	      x0vncserver  uses	 a  "deferred update" mechanism	which enhances
	      performance in many cases. After any change to the  framebuffer,
	      x0vncserver  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  ver-
	      sions  of	x0vncserver, 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	accel-
	      erates 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.

       Xvnc(1),	vncpasswd(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  par-
       ticipated  in  development, testing and support.	This manual is part of
       the TigerVNC software suite.

TigerVNC							X0VNCSERVER(1)


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