Windows Server 2003:
In IIS, right-click on the website for which you generated the certificate and click “Properties“.
Now click on the “Directory Security” tab and then the “Server Certificate” button.
Select the option to process the pending request.
Now browse for the .cer file that you received from the Certificate authority and click Next and then Finish.
IIS will then ask to confirm the port on which secure communications to the list will listen on. Leave this as port 443, and click Finish.
Windows Server 2008:
In IIS 7, click on the server name (svxxx(svxxx\DataCAdmin)), then open “Server Certificates” and select the certificate you wish to complete.
On the taskbar to the right, click “Complete Certificate Request”
Select the certificate from the directory where the .cer file resides.
Make the friendly name “domain date” (example; www.site.com 11-12). Click “OK”
After installing the .cer file you will need to assign it to the site.
To assign the certificate to the site you will need to right click on the site, “Edit Bindings”
Select the “https” binding(s) and “Edit” the binding.
Select the drop down window and choose the certificate that you just created.
If the site has not previously had a certificate installed:
You will need to update the bindings to allow acces to the site on port 443.
Navigate to your site. Click Your Site, then click “Bindings” on the right panel.
Add bind for “https://” then you will need to select the certificate from the list at the bottom of the window.