[header] How to prevent users from accessing unauthorized websites on the isa server [title] Create a list of blocked websites. [substeps] From your computer, click on the start menu, hover over programs, click on " microsoft isa server, " and select " isa management " to display the isa management options window. Next to servers and arrays, click on the plus symbol to expand the field and locate your server name. 
Next to your server name, click on the plus symbol to expand the field. Click on the plus symbol to expand policy elements.