"andres***@gmail.com" wrote:

> I have 2 computers both running windows home. One is on my office and
> the other is at home, behind a router. Both machines run Windows
> Firewall.
>
> I also setup a VPN connection between them. The one on my office being
> the server and my laptop at home as the client. I followed Windows
> Wizards in Add a new connection in both of them to setup the connection
> without doing anything special.
>
> I can get it to work if I disable any of the two windows firewalls.
> This is a especially strange at the client side, as the firewall should
> have nothing to do there.
>
> The error I'm getting is Error 721. The error message appears after I
> wait for like a minute in the dialog "Verifying Username and Password".
>
> Thanks for any help.
>
>

news:1160315070.885771.233360@i3g2000cwc.googlegroups.com...
>> Hi Andy,
>> First you should configure your Router to allow VPN network connecion and
>> allow traffics between your Laptop (client) and Desktop Offce (server).
>> Are you able to ping from the Laptop?.
>> Have a look at this article:
>> http://technet2.microsoft.com/WindowsServer/en/library/0332e37c-61da-44fe-9633-4438d37e19021033.mspx?mfr=true
>> HTH.
>> Please let us know.
>> Regards,
>> nass
>> -----------
>> www.nasstec.co.uk
>
> Nass, thank you for your reply.
>
> My router has VPN traffic enabled (both PPTP and L2TP). I don't think
> it has anything to do with it, as I can get the connection to work by
> just disabling any of the two windows firewalls and leaving the router
> alone.
>
> I am able to ping from the laptop. In fact, I run various services in
> my Desktop at the office (Cygwin/sshd, VNC, etc...) and they all work
> great.
>
> The article talks about the GRE protocol. I'm not sure if it is allow
> through the Windows Firewall, but I don't know how to check, as it is a
> network layer protocol.
>

> You might make sure the XP SP2 Windows Firewall is configured to allow PPTP
> VPN traffic through...
>
> http://theillustratednetwork.mvps.org/WM2003/PPTP_VPN/LAN/WindowsFirewallAdvanced.JPG
>
> http://theillustratednetwork.mvps.org/WM2003/PPTP_VPN/LAN/WindowsFirewallAdvancedServices.JPG
>
> http://theillustratednetwork.mvps.org/WM2003/PPTP_VPN/LAN/WindowsFirewallServiceSettings.JPG
>
> When you forward TCP Port 1723 traffic through the XP SP2 Windows Firewall
> GRE Protocol 47 traffic is automatically enabled. There is a test you can
> run detailed in the "PPTP Ping" and "VPN Traffic" sections on this page that
> may help pinpoint the problem.
>
> http://www.microsoft.com/technet/community/columns/cableguy/cg0105.mspx
>
> Also check the event viewer logs for possible clues...
>
> http://www.microsoft.com/technet/support/ee/ee_advanced.aspx
>
> --
>
> Al Jarvi (MS-MVP Windows Networking)
>
> Please post *ALL* questions and replies to the news group for the
> mutual benefit of all of us...
> The MS-MVP Program - http://mvp.support.microsoft.com
> This posting is provided "AS IS" with no warranties, and confers no
> rights...