We have an ISA Arrray which has 3 ISA Servers 2006 Enterprise Editon. We have web publishing rules for sharepoint servers and have forms based authentication enabled. We have place our favicon.ico file on the sharepoint server directory Inetpub\wwwroot\wss\VirtualDirectories\443. when testing this internally on the server we can see the favicon.ico file however when accessing the site from an external connection we can't get the favicon.ico to display. We found that if we switched off the forms based authenication ther favicon.ico will display from externally. how can we get the favicon.ico to work with forms based authentication to work? any help will be greatly appreciated.