You're missing the drive mapping for your IUSR_XXX account. Your tables are on the Novell server, so you need a drive mapping to get there. Background information: Your webserver is running IIS as a service. Nobody is logged in interactively. A client hits the web page with the ISAPI DLL. IIS is logging you in on the server as IUSR_XXX. In order for the ISAPI DLL to see your tables on the Novell server, you will need the drive mapping for that user.