Can't copy files larger than ~5MB from Windows Server 2008 to Windows Server 2003 over VPN.

Hi everyone... so I'm at my wits end now...

I have two sites connected VPN.

Site A has a Windows Server 2008 file server on it which has backups via xcopy copied to it from a PC which is on the LAN also on Site A.

Site B has a Windows Server 2003 file server that is SUPPOSED to have files copied via xcopy to it from Site A's Windows Server 2008 machine.

After upgrading Site A from Server 2003 to Server 2008 - I no longer can do my backups from Site A to Site B.

I have searched for solutions to this problem and have found various things to try.  Thus far I have tried changing the MTU, disabling OpLocks, disabling SMB2.0 and various other things.

I also attempted to copy files to another Windows Server 2003 machine on Site A from the Windows Server 20008 server and had no problem copying it.  In each instance of testing the copy I am copying the same folder.  For instance... I have a folder we will call "Folder of Stuff" - when I copy "Folder of Stuff" from the Windows Server 2008 machine to the Windows Server 2003 which is also on Site A - the files copy over without a problem.  When I try to copy "Folder of Stuff" from the Windows Server 2008 server on site A to the Windows Server 2003 server on Site B - the problems begin.

Errors I have gotten in event logs - it appears each time it fails to write the files over I am getting an error or mrxsmb event id 50.  I have also searched that and can't seem to find anything.

Any help would be much appreciated - I'm on the brink of just going back to Windows Server 2003 all together.

Thanks!!!
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LionOfJudah80Asked:
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LionOfJudah80Connect With a Mentor Author Commented:
I have tried all of the resolutions in that link as well - still same result... (I'm really ready to just go back to Windows Server 2003)
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ccosbyCommented:
What antivirus do you have on the servers? Have you tried disabling it to make sure its scan isn't causing an issue?
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LionOfJudah80Author Commented:
I use Eset's Nod32 2.7 - yes I have tried disabling it.
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vguzmanIT ManagerCommented:
What network card do you have in your servers ?  Do you have the latest drivers on them ?
Try disabling the "Remote Differential Compression" in Windows features in your 2008 server.
Also check this solution:
http://social.technet.microsoft.com/Forums/en-US/winserverwsus/thread/3aad1cbc-1d51-41ee-97d2-495e143c1ea1 
and http://blogs.dirteam.com/blogs/sanderberkouwer/archive/2008/05/15/backward-compatible-networking-with-server-core.aspx 
and http://thebackroomtech.com/2008/01/29/howto-speed-up-your-network-connection-on-windows-vista/
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LionOfJudah80Author Commented:
vguzman: I have tried all of these - and still the problem exists...
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vguzmanIT ManagerCommented:
Is your network card setup to "autonegotiate" or "Full duplex" ?  Set it up for "autonegotiate" on PCs and servers. I had a similar problem with a Broadcom card on my server...
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LionOfJudah80Author Commented:
My network card is setup for auto negotiate - I have tried two network cards... one Netgear and one Intel... both I have tried setting to 100/FULL and 100/HALF along with AUTO.  It is currently set for AUTO.
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vguzmanIT ManagerCommented:
Have you tried the solutions on this link??

http://support.microsoft.com/kb/932170


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vguzmanIT ManagerCommented:
Are you using software-based VPN or hardware-based ?  Can you give more specifications about your VPN ?
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LionOfJudah80Author Commented:
vguzman: I have tried all of those solutions that are in that link - I am using hardware based VPN - a Linksys RV082 to a Linksys RV042 - Gateway to Gateway - the VPN has never been an issue before - prior to this server being a Windows 2008 server - it was a Windows Server 2003 server... I never had an issue until I installed Windows 2008...
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LionOfJudah80Author Commented:
I've tried all of the other methods, Teracopy, Securecopy and Robocopy (and GUI) - still nada...
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vguzmanIT ManagerCommented:
I have a Broadcom  BCM5708 TOE plus iSCSI Offload NIC on my Dell PowerEdge 2900 server and at the beginning gave all kinds of trouble. Can you try to update the FIRMWARE ?
I also tried so many different things but at the end it all work out fine.  Don't give up !!!
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LionOfJudah80Author Commented:
vguzman: Try updating the firmware of the NIC?  
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vguzmanIT ManagerCommented:
Like I said I have a Dell PowerEdge Server and I was able to download and update the driver and the firmware of the NICs.

http://support.dell.com/support/downloads/driverslist.aspx?os=WLHS1&osl=EN&catid=-1&impid=-1&servicetag=&SystemID=PWE_2900&hidos=WNET&hidlang=en&TabIndex=

Check under "Network"
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LionOfJudah80Author Commented:
vguzman:

That's a no there... no such updates available...
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vguzmanIT ManagerCommented:
I am running out of ideas... Can let us know the exact brand, model and currently installed driver of your network card of your 2k8 server?

Have you tried to get the latest firmware for the two routers ?

What is the MTU of the routers ?  It should be 1430 or less (mine is at 1400 and works great) for a Windows VPN which uses PPTP if using the basic client or 1460 for L2TP connections.  

You can use DrTCP to change the MTU of your NICs (server and PCs). Follow the instructions on: http://www.dslreports.com/faq/5793

Also try testing your VPN MTU here: http://www.dslreports.com/faq/7724

Good luck!!
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