Fix for Mapped Drive gets disconnected while copying large files in Windows 7 and Vista

In Windows Vista or Windows 7  it is often seen that Mapped Drive gets disconnected when a data transfer like copy or move action is in progress. The problem occurs because of  Windows Vista’s Auto tuning network feature  So if you are more into copying large files from one computer to another it is recommend to turn this feature off.

To turn Auto Tuning network off:

  • Run the command prompt in administrative mode
  • pressing ctrl + shift + enter or right click and run as administrator OR right click on command prompt and selecting run as administrator
  • To turn auto tuning off type “netsh int tcp set global autotuninglevel = disabled” and if this doesn’t work try netsh interface tcp set global autotuninglevel=high
  • To turn it on again : “netsh int tcp set global autotuninglevel = normal”

Turn Auto Tuning Off in Windows

Once you get an Ok message, reboot your computer for settings to take place. To make sure Auto Tuning setting was changed, run the command netsh interface tcp show global, this will display all the major config of TCP and you will see Recieve Windows Auto Tuning Level as disabled if you set it so.

Windows Auto Tuning Check

Read more about this here. This feature will not work on Windows XP machine as it is not available there.

What Other things are fixed using this command ?

  • Performance Issue using Remote Desktop Connection.
  • Windows Live Messenger Login Issues.
  • Improvement in Network Performance.


  1. im facing same problem. when i copy any files from mapped drive and paste it to my local pc , the copeing process shows the process bar as working, and in few second it stuck and no movement any more, and try to cancel also not working, i m using windows7 and mapped drive os is server 2003. plz help me .

  2. hi, while copying a 10GB file to a pen drive, its stucking at 54% and not getting resumed at all. Even the copying process won’t closing. I am using windows vista. can you help in this? the above cmd promt already tried. but not worked.

  3. Thanks for this. Is autotuning supposed to be disabled on the source or destination (computer hosting the mapped drive)?

  4. Thanks a lot! Yesterday I installed a new NAS and had to copy zillions of large files to it, and each time it failed after a few minutes with the error you described. I tried to disable the TCP window tune thing first, but it didn’t work. Then I tried the “high” setting and it worked perfectly! (after rebooting Windows of course – almost missed that, don’t forget to reboot!)

    This is really a great tip. Thanks so much again!!!!

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