VPN disconnects when transferring files

[chicagotech]

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
"GTS" <x> wrote in message news:un2GBdD4HHA.1824@TK2MSFTNGP04.phx.gbl...
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

"Robert L [MVP - Networking]" <noreply> wrote in message news:OZMU2WC4HHA.1900@TK2MSFTNGP02.phx.gbl...
It could be the MTU 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
"David" <David> wrote in message news:DDD86E32-8EF8-48B9-83DD-2586550E31C3@microsoft.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

[chicagotech]

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.

[chicagotech]

Also check this post,

RDC over VPN disconnects in a several minutes
http://www.chicagotech.net/netforums/vi ... =2290#2290

[chicagotech]

Also check these posts.

vpn connection drops after 3 minutes
Check the MTU settings first. Or this search result may help, VPN IssuesCan XP Home have multi VPN connections open simultaneously, like NT and W2K Pro? ...
www.chicagotech.net/netforums/viewtopic ... 05cee4718e -

Solved: Black screen when ...Problem: after the client installed a new USR8200 VPN firewall, ... Checked the MTU on the firewall and found the MTU is set 567 (we don't know why). ...
www.chicagotech.net/netforums/viewtopic.php?=&p=571

[chicagotech]

Thank you for the feedback.

--
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


"David S" <DavidS> wrote in message news:A7419809-35ED-4E71-9DA2-B53138F398B8@microsoft.com...
> Thank you Robert!
>
> It did turn out to be an MTU issue with the aircard. Since there was no
> place to change the setting in the card's software, I had to go into the
> registry and find it. Changed it from 1300 to 1500 and all is fine now.
>
>
> "Robert L (MS-MVP)" wrote:
>
>> It may be MTU issue. These links may help,
>> connection to remote computer was broken caused by network error
>> I would check the MTU first. Or check this link: vpn drop connection
>> .... Then he can use RDC over VPN. Related Topics. How to change MTU . ...
>> www.chicagotech.net/Q&A/vpn54.htm
>>
>> Can't access RDC over VPN
>> Black screen when RDP over VPN. Situation: The client has a
>> site-to-site VPN setup with ... Then he can use RDC over VPN. Related
>> Topics. How to change MTU ...
>> www.chicagotech.net/Q&A/vpn47.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
>>
>>
>> "David S" <DavidS> wrote in message
>> news:FAED7195-CF1D-48CA-968C-30E51BC00EEF@microsoft.com...
>> >I have an odd issue. We have a laptop that we use to connect remotely using
>> >a
>> > Verizon Broadband card. What we do is connect to our network using a
>> > Windows
>> > VPN connection, then use Remote Desktop to connect to a workstation. This
>> > configuration had been working just fine.
>> >
>> > We can connect to the VPN and Remote Desktop using a LAN or wireless
>> > connection, but now, for no apparent reason, when using the broadband card
>> > we
>> > can connect to the VPN but the Remote Desktop will not connect. It just
>> > sits
>> > there and then finally times out with a message of "can't connect to the
>> > remote computer".
>> >
>> > Every other method we use to connect to Remote Desktop via VPN works just
>> > fine.
>> >
>> > Any ideas?
>>
>>
>>