Replacing a certificate that is about to expire on the Active Directory Federation Services (ADFS) server. The process is simple and we will show all the steps in this Tutorial.
The first step it to import the certificate on the Computer store using mmc. In the current scenario, I had a certificate that was about to to expire as show in the image below. Make sure to add the new one with the private key.
The next step is to open AD FS management tool, expand Service, and click on Certificates. A list of all certificates will be displayed. We can see that the current one will expire in 21-September-2016.
In order to replace it, click on Set Service Communications Certificate and select the new certificate from the list (step 2).
Click on Okay, and the new certificate is ready to be used.