I am trying to implement a redirection for forms-based authentication for Exchange Outlook Web Access according to KB555053. Part of the process is to modify the 403;4 Custom error, however, on this particular IIS server, the 403;4 is not in the list. The server is Windows 2003 Standard, SP1 running IIS 6.0.
Where does the list of Custom errors originate? Is there a way to add to the list?
Thanks in advance.