Why MethodNotAllowed all of a sudden?

I'm using shortcuts for login, logout etc. in routes.rb, for example:
map.login 'login', :controller => 'session', :action => 'new'

When I access http://localhost:3000/login I get following exception:
ActionController::MethodNotAllowed

Only get, head, post, put, and delete requests are allowed.

Does anyone know what's wrong there? I'm using 2.1.0 btw.