How i create a exception in location to allow access to page GanttViewer.aspx with other rol and others pages only with Admin rol
<location path="Admin">
<system.web>
<authorization>
<allow roles="Admin"/>
<deny users="*"/>
</authorization>
</system.web>
</location>
Specify another Location section as you have above with the path specified all the way down to the file.
For each location define the different authorization rules required.