Why does my VPN stop working?

[snoig]

I have Windows Server 2003 set up as my VPN server using pptp. My
clients are both Windows XP Home and Pro. I have everything set up
and working fine but after awhile, some of the clients just stop
working. When I look in the remote access console, I can see that
they are connected but I can not ping them. If they disconnect the
VPN and reconnect, everything works fine again.

Anybody have any ideas what could be causing this? Would switching to
IP/Sec be more reliable?

TIA

 

[Robert L [MVP - Networking]]

Post the result of ipconfig /all after establishing the VPN.

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
I have Windows Server 2003 set up as my VPN server using pptp. My
clients are both Windows XP Home and Pro. I have everything set up
and working fine but after awhile, some of the clients just stop
working. When I look in the remote access console, I can see that
they are connected but I can not ping them. If they disconnect the
VPN and reconnect, everything works fine again.

Anybody have any ideas what could be causing this? Would switching to
IP/Sec be more reliable?

TIA

 

[snoig]

Post the result of ipconfig /all after establishing the VPN.

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting onhttp://www.ChicagoTech.net

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

Here you go. I just went through and adjusted all the MTU's on one
remote network but I still have the same problem.

C:\Documents and Settings\nss>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : nss-admin
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Unknown
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek RTL8139 Family PCI
Fast Ethe
rnet NIC
Physical Address. . . . . . . . . : 00-20-ED-93-81-3A
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 192.168.20.60
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.20.1
DNS Servers . . . . . . . . . . . : 68.87.85.98
68.87.69.146

PPP adapter TKC:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : WAN (PPP/SLIP) Interface
Physical Address. . . . . . . . . : 00-53-45-00-00-00
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 192.168.10.130
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : 192.168.10.1

 

[snoig]

I should also mention that the VPN is set up to access our web based
accounting system. The accounting server is 192.168.10.23/acct.
Users access the system via ip address to avoid any issues with DNS.
At least for this first go round. I was trying to minimize any
potential problems.

snoig