Since WSUS is a core part of SBS 2008 and is supposed to pull updates from Microsoft and distribute the updates to computers on your network, when you call for updates, the agent goes to :8530 expecting to communicate with the Windows Update Server locally. A problem with WSUS will affect the ability of the update agent to pull down updates since the WUAgent gets no response back from an assigned WSUS server. It then throws up error 80072efd.