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To view the Reverse Proxy in action or even just testing the traffic is getting where it is supposed to be, you can run a packet capturing program on one of your Front End servers and see the 80 port traffic. The Reverse Proxy is highly recommended for publishing External Web Services for a Skype4B deployment, but it is important to note that it is not a native Skype4B server role and another product/appliance must be used to provide this function. This allows the Skye4B Front Ends to remain on the LAN while the Reverse proxy is placed in your DMZ and exposed to the internet. The blow graphic depicts the port change and the placement of the Reverse Proxy Device. The reverse proxy receives internet traffic on port 80 and 443 and then forwards that traffic to the Skype4B Front End/s on port 44. Now that we know the purpose of the two web sites, this is really where the Reverse Proxy comes into play. Skype for Business Server Internal Web Site – which is bound to port 443 and 80.Skype for Business Server External Web Site – which is bound to port 80.You can view the port bindings by selecting the site and ‘Edit Bindings’ Using differencing ports also allows the Skype4B Front Ends to use a single IP address. Our industry experts have collected the latest application modernization trends impacting the automotive, financial services, healthcare, and manufacturing verticals. Skype for Business differentiates these sites by using different ports:Īpplication Modernization Industry Quick GuidesĪpplication modernization enables you to optimize business processes and transform the way you do business today, and in the future. Not all Skype4B Web Services are designed to be exposed to the internet – examples would be the Skype4B Control Panel and the Response Group Configuration page.

Why are there separate Web Sites for Internal and External Web Services?

One web site for Internal and one for External. Let’s take a quick look at the IIS settings of a Front End Server in my lab you will see that there are two different IIS sites (Image below).

Dialin – Dial-In Conference settings information.

LyncDiscover – client sign-in and discovery.

Here are some of the Skype4B Web Service functions: Skype4B relies on the Reverse Proxy to publish its Web Services to the public Internet. So why does Skype for Business (Skype4B) need a Reverse Proxy? Ideally, the Reverse Proxy device/appliance is placed between your internal Skype for Business Front End server/s and the public internet – the recommended placement would be in a DMZ network. This is done in such a seamless manner that the Reverse Proxy is transparent to the client. The Reverse proxy is a device that receives requests from clients on and then forwards the request on to another resource, in this case a Skype for Business Front End server. First let’s start off with what a Reverse proxy is and then cover how it fits in with with Skype for Business Server.