On the web server, get the new Certificate thumbprint:
a. Start | Run | "MMC"
c. Ensure "Computer Account" is selected for the local computer
c. Ensure the "Valid From" has the correct date range (and this is not the old certificate)
4. Document the Certificate Thumbprint
d. Copy the thumbprint and paste into a text editor
b. Ensure to remove the hidden space at the beginning of the thumbprint (This is important, while not visible, there is an hidden space!)
Still on the Web Server, edit the Web.Config of the Application Server:
a. By Default this is "C:\inetpub\wwwroot\D1IMAppServer"
a. Back the current web.config file to a safe location to use if needed.
c. Save the updated Web.Config
b. Run the command "iisreset"