In this article, we are going to learn how to install the Authentication Extender using the SphereShield installer.
Before proceeding make sure to follow this KB in order to generate the user properties file.

What is the Authentication Extender

The Authentication extender is an optional component that is mandatory only when using SkypeShield Credentials (Dedicated credentials).
This component is directly connected to the SfB/Lync FE and the CAS/Exchange server, it will need delegation for these servers to give it privileges over these servers.
This component is a middle-man between the DMZ Bastion and the internal traffic, it receives traffic from the DMZ and authenticates on its behalf.

Installation

1. Right-click the installer and run it as an administrator.
2.  When prompted with this windows click 'SphereShield for Skype for Business'


3. If no properties file was detected you will be asked to choose (if you have).
    Click yes, to specify a file and no to proceed without specifying. The default location of the file should be at:

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1. Go in [Active Directory Users and Computers] and select in [View] → [Advanced Features]
   
2. Go to [Delegation] under the properties of the Computer object for the Authentication Extender server.
   
3. Add the SPN for the HTTP service of the pool and the Front-end server.
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4. Add the Exchange servers in the same manner as above in case the EWS protector is also incorporated in the deployment

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Direct delegation per each Front-End/CAS instance

In the case of smaller deployment, you can delegate Kerberos directly to the server.

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