Problem:
Today I encountered a problem with IPV6 (Internet Protocol Version 6) configuration, when I  tried to ping a windows 2008 R2 server I got response from IPV6 interface (Reply from ::1: time<1ms)

so I disabled the IPV6 under network connection, in spite of that I continued to get the same reply.
Solution:

• Open Registry Editor (regedit).
• 2. Navigate to the following registry key:
• HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\tcpip6\Parameters\
• Create the following registry value (DWORD type): DisabledComponents
• Set value to 0
• Restart your server.

Yaron
Thanks to Yaron –  https://vvirtual.wordpress.com/2012/02/29/reply-from-1-time1ms-ipv6/

reg add hklm\system\currentcontrolset\services\tcpip6\parameters /v DisabledComponents /t REG_DWORD /d 0xFF