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SOA Patterns with BizTalk Server 2013 and Microsoft Azure - Second Edition by Mahindra Morar, Colin Dijkgraaf, Johann Cooper, Mark Brimble, Richard Seroter

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Relay Service

There are many challenges to overcome if you wish to externally expose a WCF service hosted on premise. You will need to potentially make changes to some or all of these infrastructure components within your environment: NAT, routers, hardware firewalls, and software firewalls.

Normally, a reverse proxy server would be used and firewall rules would be created to expose a WCF service. The following diagram shows the typical network infrastructure required to expose a service externally to the Internet:

Relay Service

However, with the introduction of Azure Service Bus Relays, there is no requirement for proxy or firewall changes, provided outbound ports ...

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