I have a program that runs through the web on my server. A couple of weeks ago it stopped allowing anyone to login. It gives this error (even trying from the server itself) HTTP Error 401.1 - Unauthorized: Access is denied due to invalid credentials. I did not knowingly do anything to change iis or the program. I did realize this morning that I ran a script to try to set the default ftp domain on another server a few weeks back. Could this have affected the logon procedure for an iis website on another server (if it changed something domain wide)?