>Hi,
>
>I'm testing a W2K3/IIS6 webweserver. Where anonymous access is disabled I can't seem to authenticate from IE7.
>On a IE6 browser I use either 'username' or 'webservermachinename\username' successully. With a IE7 browser both of these are rejected and the text in the User name textbox changes to 'www.xxx.com\username'. Only successful login is by specifying the webserver IP address in the URL.
>
>Of course this may not be a IE6/IE7 issue - the browsers are on different machines (IE7 is in fact on the webserver itself) and the URL is mapped to the webservers IP address in the HOSTS file in both cases. Nevertheless I'm pretty sure this was working OK on the webserver under IE6.
>
>UPDATE: Just tried from IE7 on another machine and that works as expected. So it appears to only be an issue when using the IE7 browser on the webserver. Maybe some DNS quirk?

Just a SWAG, but security groups can be configured to deny console (local) logon to server(s) - maybe the account you're trying belongs to such a group? You could test by trying with the local server or domain admin credentials.

Another even SWAGgier guess is that there are various Group Policies available for IE. You could check them and see if any are changed from the default:

- run gpedit.msc
- check Local Computer Policy...Computer Configuration...Administrative Templates...Windows Components...Internet Explorer