My setup is as follows. Cisco e3000 as the only switch. I have 3 computers wired to, and two more over wireless. Three wired computers are 1 Windows 7 64bit, 1 OS X (10.6), and 1 CentOS 5.5. HomeGroup is not setup, and IPv6 is disabled on the Windows Box. From either the Mac or the Linux box, reading and writing files to the Windows 7 PC works great, large file transfers will hold around 100 MB/sec. However, when using the Windows 7 box, I can copy files from either of the other two and get sustained ~100MB/sec, but when copying a file from the Windows 7 PC to one of the other boxes, I get a sustained rate of around 40 KB/sec. I just recently upgraded the Windows 7 box. New motherboard, processor, RAM. Re-installed windows, and since this, I have had the network issues. Before this, I could read/write just like one would expect. I've tried everything I could find on line, but nothing has helped copying a file from the Windows PC to another box. At this point, I think I have three options to try and narrow down the problem. 1. Reload windows from previous build's image and update drivers for the new motherboard to see if something went wrong with my latest windows install. 2. Pick up another network card and see if that has the same issue. 3. Install a different OS to see if is also has the same problem. That should at least tell me if it is a Windows 7 issue, or a hardware issue. Other than doing this, I have no idea what might be the problem.

texx14 wrote: My setup is as follows. Cisco e3000 as the only switch. I have 3 computers wired to, and two more over wireless.  Three wired computers are 1 Windows 7 64bit, 1 OS X (10.6), and 1 CentOS 5.5.  HomeGroup is not setup, and IPv6 is disabled on the Windows Box. From either the Mac or the Linux box, reading and writing files to the Windows 7 PC works great, large file transfers will hold around 100 MB/sec. However, when using the Windows 7 box, I can copy files from either of the other two and get sustained ~100MB/sec, but when copying a file from the Windows 7 PC to one of the other boxes, I get a sustained rate of around 40 KB/sec. I just recently upgraded the Windows 7 box.  New motherboard, processor, RAM.  Re-installed windows, and since this, I have had the network issues. Before this, I could read/write just like one would expect.  I've tried everything I could find on line, but nothing has helped copying a file from the Windows PC to another box.   At this point, I think I have three options to try and narrow down the problem. 1. Reload windows from previous build's image and update drivers for the new motherboard to see if something went wrong with my latest windows install. 2. Pick up another network card and see if that has the same issue.   3. Install a different OS to see if is also has the same problem.   That should at least tell me if it is a Windows 7 issue, or a hardware issue.  Other than doing this, I have no idea what might be the problem. I'd say the problem most probably lies in the NIC / NIC driver area or it is a routing issue. As an additional test I'd disable TCP/IP Window scaling on the Win7 PC and see if that helps. Did you only try to copy via Explorer or did you also try to use e.g. robocopy or a simple copy from the command-line and did they all reveal the same result? Wolfgang

texx14 wrote: Tried from both explorer and using the command line ftp with the same results. I did the   *netsh interface tcp set global autotuninglevel=disabled *on the PC, but got the same results. I have ordered a new NIC, which should arrive tomorrow.   Thank you. You say "using the command line *ftp*" . Do you copy via FTP? Because that's something totally different from using shared folders. Do you use the builtin FTP server, which is included in IIS? In that area I have no experience with performance expectations as I don't use that for accessing files locally. Wolfgang

Hi , Whats the result after updating a new NIC? Also, please try to disable Remote Differential Compression to see if it can improve performance for copying files. Remote Differential Compression (RDC) allows data to be synchronized with a remote source using compression techniques to minimize the amount of data sent across the network. How to disable Remote Differential Compression ============================= 1.Click Start>Control Panel>Programs>Turn Windows features on or off. 2.Uncheck Remote Differential Compression and click OK. 3.Restart the computer and test the result More information about Remote Differential Compression (RDC), please see: http://msdn.microsoft.com/en-us/library/aa372948%28VS.85%29.aspxTracy Cai TechNet Community Support

I have disabled Remote Differential Compression as well, and got the same results, 20-40KB/sec copying a file using explorer. Using command line ftp, I just connected to the FTP server on the Mac, and tried uploaded a small file (1.5mb). Took forever, almost 3 minutes. New NIC should be waiting on my when I get home this afternoon. Will post an update when I try it out. Thanks for the suggestions all. I'll keep trying.

Well, I put in the new NIC (intel PCI-X gigabit) and network upload speeds shot up to what they should be. On a whim, I switched back to the integrated network adapter, and lo-and-behold, network upload speeds were fine as well. Removed the new NIC and network speeds have been fine ever since, up and down. Go figure.