Firewall on Demand

        except:

            user_exists = False

        user = authenticate(username=username, firstname=firstname, lastname=lastname, mail=mail, authsource='shibboleth')

        if user is not None:

            try:

                peer = user.get_profile().peer

            error = _("Something went wrong during user authentication. Contact your administrator")

            return render_to_response('error.html', {'error': error,},

                                  context_instance=RequestContext(request))

        error = _("Invalid login procedure. Error: %s" %e)

        return render_to_response('error.html', {'error': error,},

                                  context_instance=RequestContext(request))