Moving VNC Server ports to a number less than the default 5800

Calculating VNC Server and VNC Viewer Ports

To start a vnc server session you normally issue a command such as

vncserver :<number>

Where number is the X server display you want it to be

vncserver :1

To connect to the vncserver above using the linux vncviewer application this equates to a vncviewer host:port setting of

vncviewer localhost:5901

or when using the host:x_display_number syntax

vncviewer localhost:1

or if using the java web applet a URL of:

http://localhost:5801/

However when you want to move the vnc tcp server port so that perhaps you can attach from behind a firewall you may need to specify a port number under 5800/5900

vncserver :<number> = 65536 - 5900 + "rfbport" <-- the port you want to use to connect using vnc i.e 80, 21, 1494 etc

vncserver :<number> = 65536 - 5900 + 1494

vncserver :<number> = 61130

command vncviewer "<host>:<port>"

vncviewer port = 65536 + "< real TCP port>"

vncviewer port = 65536 + 1494

vncviewer port = 67030