VNC Ports

Mac Reiter reiter "at"
Mon, 26 Feb 2001 15:46:31 +0000

>Hi Brett,
>VNC requires two ports to go in and out 5800 and 5900. Will not work any
other way.

Sorry, but if you don't know what you're talking about, PLEASE don't send
in answers.  People get confused enough without deliberately presenting
false information.

5900 + <display number> (or 59xx in shorthand) is the ONLY required in/out
port.  That is the VNC protocol port.

58xx is a convenience, and the only thing it does is serve up a Java
version of VNCviewer, which then connects (using the standard 59xx port,
just like all other viewers) back to the server.  As long as you have a
normal executable version of VNCviewer, you can block 58xx with impugnity.

I have also seen people asking about port 80, which VNC servers do NOT use
at all.  That confusion arises because of the mini-HTTP server that is
running at 59xx.  Many people see "HTTP" and immediately assume it is at
port 80.

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