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Enable UltraVNC to connect across subnets

Posted on 2009-07-10
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Last Modified: 2013-11-30
We have multiple Win XP machines on site on 2 different subnets.  We recently upgraded our UltraVNC software from version 1.0.2 to 1.0.5.  We added the software to our PC image so that when we reimage a machine, VNC is installed and we can remote connect to it.  Unfortunately, unless the reimaged PC is on the same subnet as the computer we're connecting from, we cannot connect to the computer.  

Any ideas where to look?  Firewall ports are open on the reimaged machines.  We're clearly missing a step in the setup that we lost in the upgrade.  

Thanks!
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Question by:uwmdes
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by:nick2253
ID: 24827547
By your comments, I'm assuming that two computers on the same subnet can connect just fine?  If they can't connect, then there may be a problem with the VNC install on the image.

--Nick
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by:uwmdes
ID: 24827696
That's correct. Two computers on the same subnet can connect just fine.
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by:nick2253
ID: 24827721
Can the computers on the different subnets ping each other?

--Nick
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by:javiersantana
ID: 24831077
Well, you would need to create a default route in your routing table in order for the 2 separate subnets to communicate with each other. You can either do this on your device that controls network layer protocols or you can create persistent routes on each workstation individually.

Was this working before the upgrade?
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by:uwmdes
ID: 24839074
Pinging the computer on the different subnet works fine.  Also, we still have a number of machines with the old version of UltraVNC running on the other subnet that can be connected to just fine (both through pinging and UltraVNC).  I checked the Admin settings for UltraVNC on an existing machine and on one of the reimaged machines, and they appear to match.  The firewall settings also appear to match.  

All of this was working before the upgrade.  There are 2 variables though.  One is the UltraVNC upgrade.  The other is the fact that we reimaged the machine, so all of the firewall settings had to be reapplied - hopefully correctly.  Though, again, between an existing machine and a newly reimaged machine, the settings appear to be the same.
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uwmdes earned 0 total points
ID: 24843995
We figured it out.  The way we were reopening the ports after reimaging was by using netfw.inf and calling "netsh firewall reset" on startup.  The instructions we found for altering netfw.inf included setting the open ports to "LocalSubnet" rather than "*" which allows them to be accessible from any subnet.  Changing this fixed the problem.  Thanks anyway for your help!
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