If you already have your SSL Certificate and just need to install it, see IIS 8 and IIS 8.5 SSL Certificate Installation.
How to create a CSR on Windows Server 2012 - IIS 8 and Windows Server 2012 R2 - IIS 8.5
Note: You can use the DigiCert ® Certificate Utility for Windows to create your CSR and to automatically install the certificate on any Windows server.
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From the Start screen, click or search for Internet Information Services (IIS) Manager and open it.
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Click on the server name.
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From the center menu, double-click the "Server Certificates" button in the "IIS" section (it is in the middle of the menu).
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Next, from the "Actions" menu (on the right), click on "Create Certificate Request..." This will open the Request Certificate wizard.
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In the "Distinguished Name Properties" window, enter the information as follows:
Common Name - The name through which the certificate will be accessed (usually the fully-qualified domain name, e.g., www.domain.com or mail.domain.com).
Organization - The legally registered name of your organization/company.
Organizational unit - The name of your department within the organization (frequently this entry will be listed as "IT," "Web Security," or is simply left blank).
City/locality - The city in which your organization is located.
State/province - The state in which your organization is located.
Country/region - If needed, you can find your two-digit country code in our list.
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Click Next.
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In the "Cryptographic Service Provider Properties" window, enter the following information and then, click Next:
Cryptographic service provider - In the drop-down list, select Microsoft RSA SChannel..., unless you have a specific cryptographic provider.
Bit length - In the drop-down list, select 2048 (or higher).
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Click the ... box to browse to a location where you want to save the CSR file. If you just enter a filename without browsing to a location, your CSR will end up in C:\Windows\System32.
Remember the filename that you choose and the location to which you save it. You will need to open this file as a text file and copy the entire body of it (including the Begin and End Certificate Request tags) into the online order process when prompted.
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After you receive your SSL Certificate from DigiCert, you can install it.