ASP.NET Forms based Login

For login forms like those built in ASP.NET where you have some dynamic fields, you'll need to use a Forms - Client Initiated profile instead of the normal Forms profile. The client initiated profile will cause APM to inject some javascript into the page that will populate the fields and then submit the form.

As far as the form parameters you set up in the profile, you should only include the username and password ones. Don't add the eventvalidation or viewstate stuff, since they're generated from the ASP.NET serverside.

Hope this helps.