disable ipv6 loopback windows 2008 r2

1] Download appropriate “Fix it” from the following URL:

http://support.microsoft.com/kb/929852

[2] You can do it by modifying registry. This is for the advanced users only. Serious problem might occur if you modify the registry incorrectly.

To disable IPv6 components, follow the below steps:

1. Click Start -> type regedit in the Start Search box, and then click regedit.exe in the Programs list.
2. In the User Account Control dialog box, click Continue
3. Go to the following location in registry:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\

4. Double-click DisabledComponents to change the DisabledComponents entry.

5. If the DisabledComponents entry is unavailable, you must create it. To do this, follow these steps:

5.1 In the Edit menu, point to New, and then click DWORD (32-bit) Value.
5.2 Type DisabledComponents, and then press ENTER.
5.3 Double-click DisabledComponents.

6. Type any one of the following values in the Value data field to configure the IPv6 protocol to the desired state, and then click OK:

- Type 0 – To enable IPv6 components
- Type 0xffffffff – To disable IPv6 components except the IPv6 loopback interface.
- Type 0×20 – To prefer IPv4 over IPv6 by changing entries in the prefix policy table.
- Type 0×10 – To disable IPv6 on all nontunnel interfaces (both LAN and Point-to-Point Protocol [PPP] interfaces).
- Type 0×01 – To disable IPv6 on all tunnel interfaces. These include Intra-Site Automatic Tunnel Addressing Protocol (ISATAP), 6to4, and Teredo.
- Type 0×11 – To disable all IPv6 interfaces except for the IPv6 loopback interface.

Also make sure that you uncheck “Internet Protocol Version 6 (TCP/IPv6)” from your network adapter properties.

- See more at: http://blog.webhostingdiscussion.net/windows/disable-ip-version-6.htm#sthash.IhAO8p6O.dpuf