> Since I was unable to get the RT External Auth setup working with my Active > Directory Environment
Seems to me that if you can get RT::Extension::LDAPImport to work, then you'll have a fighting chance of getting RT::Authen::ExternalAuth to work as well. Please post to the list your working LDAPImport config along with your non-working ExternalAuth config. For me, before I was able to get ExternAuth working, I first had to figure out how to bind to the LDAP server as a user (by providing that user's password). Once I was able to bind using 'ldapsearch' from the Linux command line, configuring ExternAuth was suddenly very easy. Once you have it set up, ExternalAuth will automatically create/update internal RT users for the LDAP users it authenticates, according to the "attr_map" setting.
