I have an application that is using LDAP only with Single Sign On running on a windows 2003 server, running iis 6.0 My Domain Functional Level: Windows 2003 Server, Forest Functional level: Windows 2003 My web.config authentication is set: <authentication mode="Windows"/> <identity...

There's a whole host of other stuff you might need to consider as well. For example, if you're going to have more than one AppPool, you'll need to sort out authentication with this command (run from AdminScripts folder): cscript adsutil.vbs set w3svc/NTAuthenticationProviders "NTLM"...