We have a remote user running VNC 4.1.1 on a Win XP Pro machine.  He
connects to our office network through a VPN connection.  In the office,
nearly all machines have VNC Server running, most 3.3.7 with a couple
4.0 and a couple 4.1.1.  These are mostly XP Pro with a handful of other
OS versions such as 2000 Pro, 2000 Server, and Server 2003.  We have
discovered that the remote user, using the standard (non-listening)
viewer can successfully connect to VNC servers on any 2000 OS or 2003 OS
machine, but has no luck when trying to connect to an XP machine.  It is
not a name resolution issue because we have tried with the literal IP
address.  It is not a network issue because he can successfully ping the
destination machine.  All XP machines in the office are set by group
policy to allow port 5900 through the Windows Firewall.  If he runs the
viewer in listening mode, we can then add him at our end and he can
connect successfully.  However, there may not always be someone at this
end to add him in.  Do you have any ideas as to what may be causing this
problem?

Paul Boxell
Underwater Kinetics
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