login_required不起作用，为什么？

def login(request):
    if request.method == 'GET':
        form = LoginForm()
        return render_to_response('login.html',RequestContext(request,{'form': form,}))
    else:
        form = LoginForm(request.POST)
        if form.is_valid():
            username = request.POST.get('username', '')
            password = request.POST.get('password', '')
            user = auth.authenticate(username = username, password = password)
            if user is not None and user.is_active:
                # Correct password, and the user is marked "active"
                auth.login(request, user)
                # Redirect to a success page.
                #return render_to_response('equipmentdemo1.html',RequestContext(request))
                return HttpResponseRedirect(reverse('equipmentapp.views.reporttable',kwargs={}))
            else:
                return render_to_response('login.html',RequestContext(request,{'form':form,}))
        else:
            # Show an error page
            return render_to_response('login.html',RequestContext(request,{'form':form,}))

以上是我的登录函数，equipmentapp.views.reporttable是登录后的目标网页的视图函数。代码如下：

@login_required
def reporttable(request):
    report_table = RepairReport.objects.all()
    return render_to_response('reporttable.html', RequestContext(request, {'report_table': report_table, }))

我的想法是：reporttable对应的网页只有通过登录界面的认证，才能访问，不然，即使你输入目标网页的网址，也没有用。但现在的问题是，使用了login_required后，没有达到效果。请问问题在哪？