Disable IPV6 en Windows 2008
Crear un archivo .reg con el siguiente código y ejecutarlo.

Now You must restart your computer for these changes to take affect.
Deshabilitar TEREDO
Turn Off Teredo by Using the Netsh Command
- Open elevated command prompt by clicking on Start, click All Programs, click Accessories, right-click Command Prompt, and click Run as Administrator. If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue.
- At the command prompt, type the following lines (press ENTER after each line):
