If your network does not natively support IPv6 you will need the Tunnel technology Teredo (http://technet.microsoft.com/en-us/library/bb457011.aspx) so that the Peer Name Resolution Protocol and Internet synchronization can correctly function. In an administrated domain environment Teredo will not be activated by default. You have to activate the Teredo-Protocol for use in a domain.

Important: Teredo requires a compatible active Desktop firewall, for example the Windows Firewall,  otherwise Teredo will be deactivated for security reasons.

You can check the current status of Teredo as follows:

1. Open a prompt with administrator privileges
2. Type in the following command and confirm with the Enter key:
   netsh interface ipv6 show teredo

The indicated status should be either “dormant“ (Teredo is not being used at present) or “qualified“. The default type is “client“; in a domain environment, however, the type should be “enterpriseclient“, otherwise Teredo will show a warning that it is deactivated in an administrated network. If the Teredo server is not available please check your firewall settings

Follow these steps to activate Teredo in an administrated environment:

1. Open a prompt with administrator privileges
2. Type in the following command and confirm with the Enter key:
   netsh interface ipv6 set teredo enterpriseclient