Reading the transactional dead-letter queue by wcf

I'm trying to create a dead letter queue service in wcf with following service configuration:

<service name="NotificationDeadLetterQueueService">
 <endpoint
  address="net.msmq://localhost/system$;DeadXact"
  binding="netMsmqBinding"
  contract="INotificationService"
/>
</service>

If I start the service host, I get a System.Messaging.MessageQueueException saying "Invalid queue path name". What is wrong in the transactional system dead letter queue adress? I can not find any ot开发者_如何学运维her examples in the net.