We have a production website running in IIS 7.5, on Windows Server 2008 R2. In IIS, in the website's settings, we added Login.aspx to the top of the Default Document list. However, on several seemingly random occasions, Login.aspx has disappeared from the Default Document list as we have had to manually re-add it after finding that the website was not loading properly due to this. Also something to note is that the Web.config file, under "<system.webServer>", specifies "<add value="Login.aspx" />". Not sure if that creates some sort of conflict, but either way, why is our Login.aspx Default Document disappearing? Thanks very much.