VPN issues

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From: Robbie Niblock (robbie_at_(NO-SPAM)systemsencore.co.uk)
Date: 01/24/05 

Date: Mon, 24 Jan 2005 10:24:19 -0000

Hi all.

I've been experiencing some VPN issues of late and I am hoping someone can
shed some light on it. I'll descibe the scenario first;

2 sites - A and B

Site A - My office
MS SBS 2003 Server, 2 x NIC - 2nd NIC connected to Draytek 2600 ADSL
modem/router/firewall. Connected using Demon Business 1000.
Internal NIC address: 10.3.0.2 , 2nd NIC address: 192.168.1.10. Address of
router is: 192.168.1.1
I should also mention we are running ISA 2000

Site B - Customers office
Windows 2000 Svr, 1 x NIC. There is a Sonicwall firewall connected to the
network. This is connected using Demon Business 2000.
Internal NIC address: 192.168.27.20, Address of firewall is 192.168.27.254

When we took over support at this site, they were running the IPSEC vpn on
the firewall itself. We had some issues connecting using this method from
behind our ISA firewall. I decided to forward port 1723 on the firewall to
the IP address of the server and use standard PPTP connections. If I connect
my laptop to the internet (a direct internet connection - not from behind
our server), this connection works fine. When my laptop is plugged into the
LAN and the internet connection is through the server, I can create the
connection, but after about 1.5 minutes - the connection drops. This 1.5
minute drop appears to be consistent.

I have tested connecting to site B from another network set up the same as
ours, and again - the connection drops after about 1.5 minutes.

Help is very much appreciated.

Best Regards

Robbie Niblock

Relevant Pages

  • Re: More on Remote Desktop
    ... Chances are good, though, that he's already got VPN capabilities on his ... firewall to do it for $100. ... > server at home...or purchase additional/new hardware... ... >> my firewall makes the PPPoE connection to my ADSL ISP. ...
    (microsoft.public.windowsxp.network_web)
  • Re: More on Remote Desktop
    ... You realize the Remote Desktop data stream is encrypted the same as a PPTP VPN link... ... Unless of course the original poster wants to implement an L2TP/IPSec VPN server at home...or ... > firewall to get between your clients and server on your own LAN. ... > setup so that my firewall makes the PPPoE connection to my ADSL ISP. ...
    (microsoft.public.windowsxp.network_web)
  • Re: Random Disconnects - ActiveSync 4.0/4.1/4.2
    ... Once I UNSINSTALLED the VPN client software (made by ... Simply disabling, or not using the client didn't matter. ... connection itself might be disabled, but the VPN client might still be ... The Windows Firewall actually is pretty good about having 'disabled' ...
    (microsoft.public.pocketpc.activesync)
  • Re: VPN not connecting
    ... did you select "enable firewall" so your firewall ... Merv Porter [SBS MVP] ... > The errors I mentioned are when I create the connection manually on my ... When I create a VPN connection ...
    (microsoft.public.windows.server.sbs)
  • RE: Encryption through NAT and State table
    ... whereas a Layer3 'stateful' firewall uses socket pairs ... The problem of running an IPSec VPN in your situation would be the key ... connection to our VPN end-point on the client network and instead will get ... Evaluating SSL VPNs' Consider NEOTERIS, chosen as leader by top analysts! ...
    (Security-Basics)