T4S Server Self-Signed Certificate Installation
To validate and authenticate allowed Salesforce connections, the self-signed Salesforce Certificate of each connecting Salesforce Org should be installed into the Trusted Certificate root folder of the Web Server.
From the Windows start menu search bar, type “run” to bring up the Windows default Run app.
Type “mmc“ and hit enter to start the Windows MMC app
From the console MMC app, select File menu → Add Remove Snap-in
Add Corticates snap-in, and select “Computer Account” → “next” → then “Local Computer“ → Save
Expand and right-click on the “Trusted Root Certification Authority”
Import the Salesforce self-signed certificate.