To generate a CSR for Microsoft IIS 7.0 perform the following steps:
There are two ways to create an SSL for IIS 7.0
1. Use OpenSSL. Download OpenSSL then follow our guide.
2. IIS won’t create the CSR in sha256 format unless you do it manually, it defaults to a deprecated format.
Go to the SSL Certificates page in your No-IP account and click on “Add CSR” Select your server and Copy and paste the entire contents of the text file into the box. Note: Open the file in a text editor that does not add extra characters (Notepad is recommended).