PI Web API administrators

When the setup program is run, PI Web API allows you to designate a local Windows group, or creates a Windows group called PI Web API Admins, whose members are the users authorized to call protected resources in the PI Web API service.

Because of the nature of Microsoft Windows group membership, and how such groups are added to the Windows token, the change might not appear to take effect immediately, especially if a user is logged on interactively. In such cases, logging out and then logging back in will produce the desired change in a user's Windows token. You do not need to restart the PI Web API service.