not sure what i am missing here..

every website suggests creating this reg key:


as DWORD and setting its value to 0xFFFFFFFF

i've done this, but when i reboot, my NIC adapter still shows IPV6 enabled.

since i have 64bit version, i also tried setting this value as QWORD. what am i missing here?

1 Answer 1


Just because it's turned off in registry doesn't mean your check box on NIC will dissapear. It just means it's disabled. Just to be sure I usually do it in both places (in registry and NIC properties). For Windows 7 however doing it on NIC properties should be enough, but for Exchange 2010 (as a side note) it brings Windows Server to knees.

Couple of ways to disable IPv6 completely (just for answer completeness):

  • Run this from command prompt reg add hklm\system\currentcontrolset\services\tcpip6\parameters /v DisabledComponents /t REG_DWORD /d 255 and then reboot.
  • Run this Microsoft Fixit utility http://support.microsoft.com/kb/929852

Some helpful links:

  • ok, how can i verify my registry change worked? and should i be using DWORD in 64bit windows?
    – Sonic Soul
    Dec 4, 2010 at 22:33
  • 1
    Running this from prompt should do it: reg add hklm\system\currentcontrolset\services\tcpip6\parameters /v DisabledComponents /t REG_DWORD /d 255 but it's exactly as you already did it. You could verify it with ipconfig /all in cmd window.
    – MadBoy
    Dec 4, 2010 at 22:37
  • ipconfig -all doesn't say anything about ipv6.. also should be using DWORD (32bit) value in 64bit windows? or QWORD ?
    – Sonic Soul
    Dec 4, 2010 at 22:40
  • windows7themes.net/disable-ipv6-windows-7.html here's a good link to get you thru. When i did ipconfig /all on my machine it shows: Link-local IPv6 Address . . . . . : fe80::4c50:ae33:88df:5fae%12, IPv4 Address. . . . . . . . . . . :
    – MadBoy
    Dec 4, 2010 at 22:44
  • 1
    See the "applies to" section of that MS link I posted, DWORD 32bit applies to 64bit versions also.
    – Moab
    Dec 5, 2010 at 3:42

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