SP2 Firewall Breaks VPN

From: Dan (Dan_at_discussions.microsoft.com)
Date: 10/29/04 

Date: Fri, 29 Oct 2004 09:13:12 -0700

2 Computers, both running XP Pro SP2. This problem has only existed since the
install of SP2.

Computer A connects to Computer B over the Internet via Windows RAS PPTP.
Both computers are protected from the internet via a NAT router on each end.

Computer A successfully connects to the VPN server on Computer B. I am able
to ping the NAT router on that remote network (192.168.0.1). I cannot ping
Computer B. I am ultimately trying to use Computer B as a host for my Palm
software and other network applications.

On the remote network, the following are the addresses in use:

192.168.0.x
.1 NAT Router
.100 Computer B
.200 VPN Server on Computer B
.201 Computer A's address on the remote network

If I turn off the Firewall and reconnect to the VPN, I am able to
successfully ping and perform all other actions.

I have installed the patch mentioned in KB article 884020 on both machines
and the problem persists.

Relevant Pages

  • Re: VPN connection cannot resolve host name
    ... OK, so now do an nslookup for a local address, an Internet address, and a ... A real common way to overcome this is to put the remote network DNS ... > Ethernet adapter Local Area Connection: ...
    (microsoft.public.win2000.networking)
  • Re: Is snort an overkill for desktop only environment ?
    ... Do you do any egress filtering at the firewall of the remote network, ... So, if you have the resources to install, maintain and monitor it, I'd ... a small branch office I'm based at. ... Securing Apache Web Server with thawte Digital Certificate ...
    (Security-Basics)
  • Re: Problem redirecting traffic from remote site into main
    ... Have you set up a network routerule to the remote network? ... To avoid spoofing issues you must let the ISA accept packets originating ... How about NAT for the remote network on the ISA external interface? ... one has a direct Internet access. ...
    (microsoft.public.isa.vpn)
  • Suse 9.2 run levels, and installation
    ... I set up my system as a single machine with multiple users without a ... remote network (supposing the internet does not count as such in this ...
    (alt.os.linux.suse)
  • RE: OWA
    ... Can this user browse other website on the internet? ... Chris Puckett, MCSE ...
    (microsoft.public.windows.server.sbs)
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