ASP.NET MVC - cross sub domain authentication/membership

Question

Hit a roadblock while implementing a sub domain based language switcher (en.domain.com loads English, jp.domain.com loads Japanese).

How do I get a single membership system to work across multiple sub domains (ASP.NET MVC C#)?

Saw something about adding domain="domain.com" to <forms > entry in web.config. Did that, but does that work when testing on local visual studio development web server?

Answer 1

Try creating the cookie yourself.

In AccountController you'll find this:

FormsAuthentication.SetAuthCookie(userName, createPersistentCookie);

that "creates and adds to the cookie collection". It doesn't allow modification of the domain (but does allow modification of the path, oddly). Instead create a cookie without adding to the collection, modify the necessary properties, then add to the collection:

var a = FormsAuthentication.GetAuthCookie(userName, createPersistentCookie);
//if you're debugging right here, a.Domain should be en.example.com; change it
a.Domain = "example.com";
HttpContext.Current.Response.Cookies.Add(a);

James