There are many ways to expose an internal server externally, and it would be impossible to cover all possible scenarios in one document, this will serve as a general guide for a couple of common scenarios. For Microsoft Dynamics CRM 2011 to be available on the internet, the Application server needs to be accessible from the internet, no matter if you choose to just open up the port or choose to do a full IFD implementation. Port Forwarding Tunnelling Reverse Proxy Port forwarding / tunnelling / reverse proxy are all possible ways of making an Internal IP address available to be accessed from an External (internet facing) IP address. This will all depend what your company current have in place, most of the above can either be achieved through hardware or software. Examples of software that can be used for port forwarding includes Microsoft Forefront Treat Management Gateway (TMG) and Microsoft Forefront Unified Access Gateway. Basically what it comes down to is the following:
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