Hello,
This just started happening about two weeks ago. I connect to a client site using Microsoft VPN client (pptp). THis has worked for well over a year until two weeks ago. Now when I try and connect I establish a tunnel but cannot access resources on the remote LAN whether by IP address or UNC, hostname, etc. After about 30 to 60 seconds the tunnel disconnects without error or notification. I have this problem on 3 of my office PCs and also if I try this from my server.
Here's where it gets strange - I have two other PCs in my home office that are on the same LAN as my business machines and they CAN establish a VPN tunnel to my customer's office and ping all devices on the remote LAN! They have the same OS (Windows XP Pro SP3) as the machines that are not successful.
Normally I wouldn't care if I couldn't reach their network remotely as I have other means of connecting, but this client has remote users and the same problem I have has happened to one of their remote users. So now I have to figure it out. I'm not sure what other detail I need to provide. I'm wondering if a new Microsoft patch has had some affect or not.
Some things I have tried:
Removing the VPN connection and adding it again
Run a repair on the NIC
Flush DNS
firewalls are disabled on all machines
unchecked and removed tcpip from NIC. Reinstalled TCPIP.
Rebooted (of course)


How do you get to these settings if you don't actually have a VPN connection configured? I am using a Cisco VPN connection and am able to VPN when I am connected to my land line connection at home. But when I disconnect and go wireless, I have the same problem that everyone has mentioned here. My LAN connection doesn't have the same Advanced options as you mention.
Thanks.
ps i had this same issue on 2 computers, cadbomb's solution for the gateway fixed this one, and the other one will be when i get to take another look at it.
I connect to my company via. VPN but once connected I cannot access any other computers on my home network.
I do not have the ability to change any properties on the VPN connection.
My work PC has 2 NIC's and the computer I want to connect to has 1. They are both on the same hub.
Thanks,
Could connect to the vpn but not the servers on the network. Thought it was the router because on other wireless networks I could connect fine. This solution did the trick however. Thanks.