Step 1 : Login into your server using RDP using Administrator login details .

Step 2 : Open Information Services (IIS) Manager.

Step 3:  Select the required server and open the Server Certificates option .

Step 4 : On the left hand side options , Click on the Create Certificates Request button .

Step 5 : Enter all the required information for the CSR and then click on next .

Step 5 : Choose the bit length to 2048 and go to next .

Step 6 : Choose the location on which you want to save your CSR and click on Finish .

CSR TXT file has been generated .