In order to move an SSL certificate from one server to another, you must Export the SSL from the server, and import it into the new server. If you followed our IIS SSL guides, exporting a certificate can be accomplished by using the Microsoft Management Console (MMC)
Using the Windows toolbar, search for MMC and run the program.
On the toolbar at the top, navigate to File > Add/Remove Snap in….
On the Available snap-ins list on the left, add the Certificates Snap-in. With Certificates under Console Root, click OK.
Click on Certificates found under Console Root. Right Click on the Personal Folder and navigate to: All Tasks > Export.
Proceed through the Certificate Export Wizard until you are prompted with “Do you want to export the private key with the certificate?”. Select Yes, export the private key and click Next.
At the Export File Format window, select Personal Information Exchange – PKCS #12 (.PFX) and Include all certificates in the certification path if possible. Then, click Next.
Now, you need to add a password to protect the private key, you can leave the encryption type as the default.
Enter a name and click browse to specify where the PFX will be exported.
After choosing the location, click Finish. The certificate along with the private key will be exported to the designated location in PFX format.
If you’re moving the certificate to another IIS server, then the next step is to import the certificate.