Network Connectivity Status Indicator for IPv6 works wrong in Windows 7 and Windows 8

Hi Folks,
I am working on testing Network Connectivity Status Indicator for IPv6 in Windows 7 and 8.
Waht is "Network Connectivity Status Indicator(NCSI)" you can refer to https://technet.microsoft.com/en-us/library/ee126135%28v=ws.10%29.aspx?f=255&MSPPError=-2147217396
I found that even if Network Connectivity Status Indicator detect IPv6 connection to http://ipv6.msftncsi.com/ncsi.txt failed.
Windows IE still use IPv6 to connect to website first, rather than stop using IPv6 and to use IPv4.
It will cause IPv6 fallback to IPv4 problem, that's 21 secs and 7 secs delay for fallback in Windows 7 and 8.
Does anyone suffer the same problem?
Or someone know how this works?
Thanks!

Hi Roger_Wang0214,
"Windows IE still use IPv6 to connect to website first, rather than stop using IPv6 and to use IPv4."
By default Windows prefers IPv6 over IPv4,we can manually configure the IPv4 prefer over IPv6 if it has result in any troubles.
Here is a link for reference :
Resolving Internet connectivity issues after World IPv6 Launch (June 6, 2012)
https://support.microsoft.com/en-us/kb/2533454
"The "Prefer IPv4 over IPv6" Fix it solution will configure your computer to prefer IPv4, instead of IPv6. By default, Windows prefers IPv6 over IPv4. If you are having problems using IPv6 to connect to some websites, this may resolve the
problem."
For a Windows 7 machine ,we can try the following fixit tool to configure IPv4 prefer over IPv6 .For a Windows 8.1 machine ,we can configure it referring to the manual part .
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\DisabledComponents
If the DisabledComponents entry is unavailable, we can create it (DWORD (32-bit) Value).Then set a value with "0x20"to prefer IPv4 over IPv6 by changing entries in the prefix policy table.
Here is a link for reference :
How to disable IPv6 or its components in Windows
https://support.microsoft.com/en-us/kb/929852
Best regards
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