As of today, Windows Azure AppFabric Service Bus Relay Service capabilities includes include load balancing feature. With this addition, you can have up to 25 listeners registered to one single service endpoint.Scale and Availability Feature (aka Load balancing) Main Features:
With this release, Authentication of user/services in Service Bus is currently handled by ACS. SB creates a buddy namespace ("-sb") in ACS to enable this. The current SWT token returned by ACS is validated by SB, using a single global signing key for all namespaces. This release ensure that each namespace has unique signing key.