On the app backup and restore Certificate Import Wizard Welcome page, click Next.
When prompted click yes to update the registry.
Now we have the backup of the CA and move these files to the new windows 2012 R2 server.
Log in to windows server 2012 as Domain Administrator or member of local administrator group.Next on the welcome screen.Click, finish on the completion screen. Open the Certification Authority Snap-in Right click on Certificate Templates Folder New Certificate Template to Reissue From the certificate templates list click on the appropriate certificate template and click ok Test the CA In here I already had certificate template setup for.Restore the Root CA backup Copy all the back up to this server Restore Database Open Certification Authority.I will leave it default and click next to continue Next window will give confirmation about service install and click on Install to start the installation process Once installation completes you can close the wizard.Private key and CA certificate and, certificate database and certificate database log.P12 -CertFilePassword (read-host Set user password -assecurestring) Type the password for the file when prompted, then confirm.You can get a list of the templates by opening the catemplates.Give one level up than backup location where the backup files are located, click OK in the Browse for Folder window and then Next to continue in the wizard.Lets see how I can reissue them.Uninstall Root CA and Domain controller Run the below mentioned command in the PowerShell or remove from system manage GUI Remove-WindowsFeature Adcs-Cert-Authority If it is domain controller, then uninstall AD and DNS from this server.It will open up Add roles and feature wizard and click on next to continue.