How to Import the root certificate using Windows PowerShell

Download the "equifax.cer" attached below.

On the windows Start menu, click All Programs.

Click on Microsoft SharePoint 2010 Products.

Right click SharePoint 2010 Management Shell and Run as Administrator.

Get the Root certificate by typing in command: (Here "c:\equifax.cer" is the path of downloaded certificate file above)

$cert = Get-PfxCertificate c:\equifax.cer

Create a trusted root authority by typing the following command:

New-SPTrustedRootAuthority -Name EquiFax -Certificate $cert

In order to verify import operation of the certificate, on the "Security" page, click on "Manage trust".

On successful import, we should see as shown below in the figure.