01-23-2009
You could try a probe from external using
tcptraceroute and check if it's being blocked somewhere on the way, but you'll probably get a definite answer if you call your ISP. That way you could also ask them if there's any other way for you to access your machine at home (sometimes they can get coaxed into opening a port).
SSH, FTP, and HTTP can use other ports if necessary, not sure about VNC, but from a security view I'd suggest to enable VNC only for localhost and using an SSH tunnel to connect.
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LEARN ABOUT DEBIAN
x0vnc4server
x0vncserver(1) Virtual Network Computing x0vncserver(1)
NAME
x0vncserver - VNC server which continuously polls an X display
SYNOPSIS
x0vncserver [parameters]
DESCRIPTION
x0vncserver is a VNC server which continuously polls any X display, allowing it to be controlled via VNC. How usable it will be depends a
lot on the machine it's running on, and what you're expecting. It won't be as fast as Xvnc or a native X server with VNC support compiled
in, but in many cases it is the best option since it is just an ordinary X application requiring no special installation.
It has many of the same parameters as Xvnc. Running x0vncserver -h will give a list of parameters with descriptions. Note that you need
to explicitly specify an appropriate password file using the PasswordFile parameter.
SEE ALSO
Xvnc(1) vncpasswd(1), vncviewer(1), vncserver(1),
http://www.realvnc.com
AUTHOR
Tristan Richardson, RealVNC Ltd.
VNC was originally developed by the RealVNC team while at Olivetti Research Ltd / AT&T Laboratories Cambridge. It is now being maintained
by RealVNC Ltd. See http://www.realvnc.com for details.
RealVNC Ltd 03 Mar 2005 x0vncserver(1)