The Service Bus Relay Azure service enables developer to build hybrid applications that run in both a Windows Azure data center and user's own on-premises enterprise environment.
The Service Bus relay facilitates integration by enabling developer to securely expose Windows Communication Foundation (WCF) services that reside within a corporate enterprise network to the public cloud, without having to open up a firewall connection or requiring intrusive changes to a corporate network infrastructure.
The Service Bus relay allows developer to host WCF services within existing enterprise environment. Developer can then delegate listening for incoming sessions and requests to these WCF services to the Service Bus running within Windows Azure. This enables developer to expose these services to application code running in Windows Azure, or to mobile workers or extranet partner environments.
The Service Bus allows developer to securely control who can access these services at a fine-grain level. It provides a powerful and secure way to expose application functionality and data from your existing enterprise solutions and take advantage of it from the cloud.
See also the official set of samples for the Azure Service Bus Relay service.
