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Configure DMZ for SharePoint provider hosted apps (accessing web site from internet).

If you are developing apps provider hosted apps for SharePoint (or Project Server) and want to deploy them to SharePoint Online you need to host your app's web site part somewhere. One good and obvious place is to host it on Azure, however I have found that in order to troubleshoot your app it is a lot easier if the app is hosted on a local IIS.

In order to host your app on a local IIS you need to configure the DMZ for the app (in addition to the website, certificate, app secret and app id).

Configure DMZ for a D-Link router

DMZ tells the router that you allow a specific port to go to a specific computer. In the following I will explain how to configure DMZ for my D-Link DI-524 router. Other routers will have similar approhes.

Log on to the router at IP address 192.168.0.1.
Enter the admin user name and password (default password is "password").

Click on the Advanced tab.

Choose
 - Enable
 - Your PC's IP address (the PC hosting the apps web site)
 -  The port your site is running on (4000 in my case, but it is properly port 80 in your case)

Click Apply. The entry is now located in the list.

You can now access your app's website from the internet.
Do not forget to also open the port in your firewall.

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