I've been banging my head against the wall on this problem for a few days, please help.

I just installed a new fileserver, (Windows Server 2008 R2), And replaced a few users laptops (Windows 7 Pro 32bit).

I am seeing incredibly slow response times between this server and the Windows 7 laptops. Only between these two types of systems though. The laptops can access file shares on Server 2003 boxes with no problems. Older Windows XP machines can access files on the Server 2008 R2 box with no problems.

Specifically, if a user tries to open a Excel file from the network share, it will open right away but Excel will be frozen and become nonresponsive for at least 30 seconds. It is not just Office files, pdfs, jpgs and other file types as well.

I ended up testing this out with others servers as well with the same results, always with Win 7 and Srv 08 R2. On the laptops, I have tried:

disabling "autotuning" disabling IPv6 disabling Remote Differential Compression reinstall network drivers disable antivirus (network threat protection) disable firewall various other fixes found around the internet.

Ping is 1ms response time, transferring a file exhibits erratic transfer speeds, 22MB/s down to 130kb/s and back up and back down or it just locks up. Wired or wireless

On the server I have tried

disabling "autotuning" disabling IPv6 disable antivirus (network threat protection)

This server is also the Domain Controller and DNS server as well as a file server. I know this really isn't the desired config, but this is for a branch office, I had no options.

Nothing in the event logs on the clients, and nothing relevant in the event logs on the server.

More details: when a user opens an Excel file for example; the file opens right away but Excel becomes unresponsive. During this time while it's frozen, the green progress bar starts again in the address bar of Windows Explorer. Once the progress bar is done loading then the file becomes available for editing.

About the only thing I haven't done is install Wireshark on the laptops and server and watch the traffic.

Any thoughts? What technologies are in Win 7 and Srv 08 R2 that is causing this type of network slowness?

As always, thanks to anyone who reads this and/or responds.


  • Try making sure that the NICs on the server are set to auto/auto for duplexing and speed...same for the switch port that it's connected to.
    – GregD
    Apr 8, 2011 at 0:20
  • Other than that, you will probably have to throw wireshark on one of the pcs and analyze the packets to chase this down.
    – GregD
    Apr 8, 2011 at 0:21
  • Thanks GregD, forgot to mention, I checked all of that, on the server and the Cisco switch as well. Thank you though!
    – lysdexic
    Apr 8, 2011 at 0:21
  • Does it take a long time to log on to the domain?
    – GregD
    Apr 8, 2011 at 0:25
  • Nope log in time is normal
    – lysdexic
    Apr 8, 2011 at 0:28

1 Answer 1


This has the fetid spoor of SMB2-related shenanigans I've seen before with a certain Symantec AV product. The fact that Win7 is affected but XP isn't, and the Win7 machines can talk to the Win2003 server just fine points a big finger at SMB2 somehow falling on its head. I saw that before about two years ago with Symantec Endpoint Security (since patched, IIRC) installed on the 2008 server. This suggests your AV or firewall product might possibly be getting in the way here

  • Excellent, thank you! I shall report back tomorrow with what I find.
    – lysdexic
    Apr 8, 2011 at 3:28
  • Ah yes, I'd forgotten about this issue with Symantec.
    – GregD
    Apr 8, 2011 at 3:39
  • Sweet! I found out that we are one version behind on Symantec Endpoint Security, but we don't have that upgrade slated until the middle of the year. So... disabling SMB2 on the laptops for now worked like a charm!! I thank both of you for your input and help!
    – lysdexic
    Apr 8, 2011 at 15:49

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