VPN disconnect after ~2mins (with SP2 & 3)

[Barry]

I have an Incoming VPN configured on a WinXP Pro PC (ie as the server).
and am using a Win XP Pro PC as the client.

It makes * authenticates the connection and I can access shared files, but
it disconnect after ~2mins.

Microsoft, say this/similar was fixed in SP2, but I am running SP3 on the
server, and SP2 on the client (I have also tried SP3 on the client) but
still disconnects.

Both server and client are behind nat routers.

Can anyone help?

 

[Robert L. \(MS-MVP\)]

You may want to check the MTU settings or this search result may help.
VPN Issues
VPN client lost connectivity VPN connection appears with a red X VPN
connection is disconnected after several minutes · VPN connection drops
after 3 minutes ...
www.chicagotech.net/vpn.htm

--
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

 

[Barry]

Hi Robert,
A bit deep!! for me.
If I provide a liitle info perhaps you could guide me as to where to look
first.

Both clients & server are as inbuilt into WinXP.

Server is WInXP Pro SP3
Client A is WinXP Pro SP2
Client B is WinXP Home SP3


Inside my test lab (ie inside its nat router):
Client A can VPN successfully to (incoming VPN) on Client B
" B " " " " " " " "
A

When trying to connect to the remote server (inside its nat router):
Client A authenticates, but VPN drops after about ~2 mins
Client B " " " " " " ~1:35 secs
(I can lead this from its event log)

Incidentally:
Client A can VPN successfully to another, separate Corp Server (running
Server 2003)

 

[Robert L. \(MS-MVP\)]

You may want to determine the optimal MTU. The following are some example.
Please post back with the result.

a.. VPN connection issues after Windows 2003 SP1
In a case you may need to modify the MTU size and wonder how to
determine the optimal MTU for your system. You can use ping command to do
so, for example, . ...
www.howtonetworking.com/casestudy/2003sp1&mtu.htm

a.. VPN connection is disconnected after several minutes
How to Change the Default MTU Size Settings for PPP Connections or for
VPN ... How to determine the optimal MTU This step-by-step article describes
how to ...
www.chicagotech.net/VPN/vpn3minutes.htm


--
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