Just of the top of my head:

1. Turn inpersonation on.

2. Try a connection string with trusted security. If this fails to connect, redirect to a login form.

3. Build a connection string with the users login name and password and send them to sql (I assume that is what you mean.)

BOb


>I need to authenticate against existing user accounts within Windows (e.g., a local account on the web server, or a domain account in the active directory, etc.).
>The catch is:
>
>1. I need mixed-model authentication.
>Some logins will be part of the company infrastructure, and some won't (because the people will be external to the company). I don't want to add the admin burden of getting those external people into the active directory. Therefore, those users should have an internal username and password preferably on a SQL backend.
>
>2. I want a single login page.
>I would like to use a single form to log everybody in, when needed.
>
>3. I would like seamless login for domain users
>It would be nice if I could get seamless login for domain users, and have them not even have to fill out the login form.
>
>I've searched around and haven't found a sample that addresses all of this. Is this wishful thinking or can this be done?
>TIA