Our GIS Server, which runs Windows 2008, was updated with Microsoft's automatic updates yesterday. Now when I attempt to access my Map Services (Flex Viewer) a box pops up in the Flex Viewer that prompts me to Sign In, with the layer name, server name, and then I must enter a username and password. It was never like this before. I cannot have my users enter a username and password for all 30 layers in the viewer. Any ideas on what is wrong?