I have a Windows 7 64 Bit machine, and I cannot find a way to disable the IPv6 Loopback. I looked at the article at How to disable IP version 6 or its specific components in Windows and shows how to set
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\DisabledComponents to various values – but none of these seems to disable IPv6 Loopback. I attempted setting this value to
0x20 – restarting my computer after each change, and I still do not get this disabled.
I am using another software called Webdriver or Selenium that gives errors when debugging if IPv6 Loopback is not disabled. It seems to attempt to connect to
[::1]:7055 and fails. Is there a way to force it to connect to
I would instead modify the prefix policies so IP4 addresses are used over IPv6 when available.
C:\>netsh interface ipv6 show prefixpolicies Querying active state... Precedence Label Prefix ---------- ----- -------------------------------- 50 0 ::1/128 40 1 ::/0 30 2 2002::/16 20 3 ::/96 10 4 ::ffff:0:0/96 5 5 2001::/32
In the list above the lines with labels 3 and 4 represent IP4 compatibility listings. If you increase their precedence they will be preferred. They need to be higher than the one with label 0 as that is the localhost address.
C:\>netsh interface ipv6 set prefix ::/96 60 3 Ok. C:\>netsh interface ipv6 set prefix ::ffff:0:0/96 55 4 Ok.
Now if you
ping localhost or the hostname it will use the IP4 address over an IPv6 address when both are available. In fact for everything with an IP4 address it will use that over an IPv6 address.
Try editing your hosts file (
C:\Windows\System32\drivers\etc\hosts). My hosts file looked like this when I first opened it:
# localhost name resolution is handled within DNS itself. # 127.0.0.1 localhost # ::1 localhost
Uncomment the IPv4 loopback address associated with localhost, and make sure the line beginning with
::1 is commented out.
# localhost name resolution is handled within DNS itself. 127.0.0.1 localhost # ::1 localhost
Two more things to keep in mind:
You'll need to start your text editor (Notepad for instance) with elevated privileges or you won't be able to save the file when you're finished editing. When starting the editor, simply right click and choose 'Run As Administrator'.
When you're finished editing, save your changes to the hosts file and reboot your machine.
Side note: on some systems an operator can ask the DNS server to re-read it's config file by sending
kill -HUP <pid>). I imagine there is a way to do something similar in Windows 7 (thus avoiding reboot).
uncheck ipv6 protocol under your lan adapter. combined with the registry edit you have, there will be no ipv6 on your system at all.
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