I installed a new proprietary management app. for documents on W2K Server. It will work along with SQL 2000 for document control. I can log in using any WNT machine or 98 machine. It all seems fine as far as configuration, to log in with the administrator name and password using explorer browser. When I try to log in with any W2K machine or XP I get a log in error. Now like I said logging in from any WNT or 98 machine with the administrator user name and password is fine, just having problems with the XP and W2K machines which are the important ones. I realize its some kind of authentication thing with kerberos, but where do I make the change on the server to accept the login from the W2K and XP machines?