VPN problem

[Jennifer lambert]

Hi

I have a problem with VNC connection via VPN through firewall. Not sure how 
to fix it. Hope to get your help.

My friends what's to work at home using her laptop (Winxp Pro) to connect a 
pc which is on a LAN(workgroup) at office. The LAN is made up 4 PCs with 
win2K Pro. One of those four PC is connecting to internet through ADSL. This 
PC is also a VPN Server, and has Sygate Firewall Pro (www.sygate.com) 
installed. Please see the attached digram to check how the LAN and laptop 
connected to each other.

The problem is when I turn off the firewall on PC1; the connection is going 
well, no problem.
But when I turn on the firewall to normal level, the laptop can connect to 
PC1 through VPN connection, but cannot connect to PC4 through VNC.

I understand that I need to open ports for VNC through, which according to 
VNC site, the ports should be 5900+display number(usually default display 
number is 0), or 5800 via Java viewer.

I opened 5900, 5800 for all protocols (tcp, udp, etc). But the VNC 
connection still could not be established. And I also can not ping from 
laptop to the VNC server.  By the way, with firewall off, I can ping VNC 
Server.

Can anybody gives me any hints on this? Thanks a lot

Jen zhao


>From: "Jerome R. Westrick" <jerry "at" westrick.com>
>To: vnc-list "at" realvnc.com
>Subject: Re: VPN problem
>Date: Sat, 16 Oct 2004 16:33:28 +0200
>
>On Sat, 2004-10-16 at 13:18, Zoran Kumurdian wrote:
> > Until yesterday, I was able to VNC via VPN connections with no issue.  I
> > am on Win XP pro SP2.  The only thing that's changed since, has been my
> > fullishness to install Microsoft updates.  I believe this is the problem
> > since nothing else has changed on my PC, the router etc.  Any ideas?
> >
> > Thank you in advance
> >
> > Zoran
>
>
>Hello Zoran...
>
>Usually this is due to the M$ firewall settings.
>Have you check thoose?  Easiest way to turn the firewall off
>and test if it works then...
>
>Jerry
>
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