After completing DNS changes, install Certificate for the Front End service and configuring trusted applications. It is recommended to restart Front End services.
On the Microsoft Front End Server, run Server Manager.
In the left navigation pane, select All Servers, and then navigate to the SERVICES section.
In the Service Filter area, type Skype for Skype for Business.
Right-click the selected service. Do one of the following:
Click Stop Services, and then click Start Services.
