When you verify that your drivers are digitally signed by the Microsoft Windows Hardware Quality Labs (WHQL), the DirectX Diagnostic Tool may try to connect to the Internet to download new WHQL certificates. During this process, no information is retrieved from your system. The tool will ask you for permission to connect to the Internet the first time you run it. This will only be asked once. To change your answer, go to the System page and select or clear Check for WHQL digital signatures.
This can also be changed by typing the following at the command prompt:
dxdiag [/whql:on] [/whql:off]
In this command, /whql:on allows the DirectX Diagnostic Tool to check for WHQL digital signatures, and /whql:off does not allow DirectX Diagnostic Tool to check for WHQL digital signatures.