VPN disconnects when transferring files

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Guest

I have one vista computer with a wired connection and one with a wireless
connection to my router. I am using the VPN client that comes with vista and
my connections are fine if I'm just hooking up to Exchange but if I try to
upload files of more than a few megabytes the VPN connection is lost. It can
immediately reconnect but the file copy will always cause it to disconnect.

I have 2 other computers doing the same tasks with XP and they never drop a
connection.

Another note is that the XP computers transfer the files about 6 to 8 times
faster.

The server on the other end is ISA 2004.

Thanks for any help

David
 
It could be the MUT issue. this link may help,

VPN connection is disconnected after several minutes
VPN connection is disconnected after several minutes. We have been seeing more and more cases like this one. We don't really know the causes, ...
http://www.chicagotech.net/VPN/vpn3minutes.htm

RDC over VPN disconnects in a several minutes

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 one vista computer with a wired connection and one with a wireless
connection to my router. I am using the VPN client that comes with vista and
my connections are fine if I'm just hooking up to Exchange but if I try to
upload files of more than a few megabytes the VPN connection is lost. It can
immediately reconnect but the file copy will always cause it to disconnect.

I have 2 other computers doing the same tasks with XP and they never drop a
connection.

Another note is that the XP computers transfer the files about 6 to 8 times
faster.

The server on the other end is ISA 2004.

Thanks for any help

David
 
Bob,

I wonder if it might be worth trying to turn off autotuning before tweaking the MTU in these cases?

TCP Autotuning ON
c:\>netsh interface tcp set global autotuning=enabled

TCP Autotuning OFF
c:\>netsh interface tcp set global autotuning=disabled

GTS

It could be the MUT issue. this link may help,

VPN connection is disconnected after several minutes
VPN connection is disconnected after several minutes. We have been seeing more and more cases like this one. We don't really know the causes, ...
http://www.chicagotech.net/VPN/vpn3minutes.htm

RDC over VPN disconnects in a several minutes

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 one vista computer with a wired connection and one with a wireless
connection to my router. I am using the VPN client that comes with vista and
my connections are fine if I'm just hooking up to Exchange but if I try to
upload files of more than a few megabytes the VPN connection is lost. It can
immediately reconnect but the file copy will always cause it to disconnect.

I have 2 other computers doing the same tasks with XP and they never drop a
connection.

Another note is that the XP computers transfer the files about 6 to 8 times
faster.

The server on the other end is ISA 2004.

Thanks for any help

David
 
Yes, thank you for the input.

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
Bob,

I wonder if it might be worth trying to turn off autotuning before tweaking the MTU in these cases?

TCP Autotuning ON
c:\>netsh interface tcp set global autotuning=enabled

TCP Autotuning OFF
c:\>netsh interface tcp set global autotuning=disabled

GTS

It could be the MUT issue. this link may help,

VPN connection is disconnected after several minutes
VPN connection is disconnected after several minutes. We have been seeing more and more cases like this one. We don't really know the causes, ...
http://www.chicagotech.net/VPN/vpn3minutes.htm

RDC over VPN disconnects in a several minutes

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 one vista computer with a wired connection and one with a wireless
connection to my router. I am using the VPN client that comes with vista and
my connections are fine if I'm just hooking up to Exchange but if I try to
upload files of more than a few megabytes the VPN connection is lost. It can
immediately reconnect but the file copy will always cause it to disconnect.

I have 2 other computers doing the same tasks with XP and they never drop a
connection.

Another note is that the XP computers transfer the files about 6 to 8 times
faster.

The server on the other end is ISA 2004.

Thanks for any help

David
 
MTU was the issue. I manually added the registry info and changed the MTU
size to 1372. That fixed it. If the auto-tune does the same thing I may try
to play with those settings as well.

In any case, thanks for the help.
 
Thank you for the update.

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
MTU was the issue. I manually added the registry info and changed the MTU
size to 1372. That fixed it. If the auto-tune does the same thing I may try
to play with those settings as well.

In any case, thanks for the help.
 
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