Like the majority of server systems you will install your SSL certificate on the same server where your Certificate Signing Request (CSR) was created.This is because your private key will always be left on the server system where the CSR was originally created.
With Microsoft systems the private key is hidden away and will only appear once the CSR request has been completed.
Your SSL certificate will not work without this private key file.
The installation of a renewed certificate is carried out via the use of a new PFX file that can be generated from the 1&1 Control Panel.
You will have to generated a new PFX file with the original SSL Private Key and the new certificate.
This article explains the steps needed to install a renewed SSL Certificate on a Windows Server 2008 OS.
The easiest method is to simply remove the current SSL for the web site in IIS and then go through the normal installation of the renewed certificate in the same way as installing a new certificate.
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Both the SSL Certificate installation and the CSR code generation, on IIS 7, should be done using the Internet Services Manager.
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Note: SSL certificates can only be used on web servers using the Common Name specified during enrollment.