Authentication Across Domains using IIS

2) On Clients machine using IE6, Tools-> Internet Options -> Internet
Zone -> Automatic Logon With Current username and password.

> Hi there,
> We are trying to set up a Web Applicaiton using ASP.Net. The web server
> is hosting the Application is on a different domain than the Domain of
> our Internal Users.What we need is a way to Pass the Authentication
> Information of our Internal Users who are logged on to their
> workstations connected to Internal domain to the Web Server which is on
> a different domain and use the same Authentication information the
> users.
> Is there any way to achieve it.
> What i have tried to do is -:
> 1) Disable Anonymous Access On and put Integrated Windows
> Authentication On on the Web Server which is on External domain.
> 2) On Clients machine using IE6, Tools-> Internet Options -> Internet
> Zone -> Automatic Logon With Current username and password.
> But when i tried to access the site on External domain from internal
> domain, it returns a 505 (Internal Server Error).I was just wondering
> how the IIS on External Domain will authenticate the users on Internal
> Domain.
> Note: There is not trust between the domains.
> Regards
> Saurabh Garg