I've installed SharePoint 2010 for my organization. When giving permissions to people I can find anyone on the organization's Active Directory easily, out of the box. No special steps are needed.
But when I tried to add a web part for searching these people it doesn't work, and any online guide I have found includes long and complicated steps to make this work.
How's it possible that when giving permissions there's simple connectivity with Active Directory but not when adding a web part?