SPContext on Forms login page

Question

How can I get the SPContext on the forms login page (/_forms/default.aspx)? Looking up SPContext.Current or SPContext.GetContext(HttpContext.Current) is always null. I need to retrieve the parent WebApplication and IIS Settings prior to logon in order to retrieve a Form Membership Provider within the SecurityTokenService Application's web.config.

I'm open to alternatives to identifying the current Web Application and Zone in order to retrieve the Forms Membership Provider.

Answer 1

The MembershipProvider and RoleProvider classes provide the name (this.Name) of the membership/role provider.