Use the below command to create a self-signed certificate: openssl req -x509 -days 365 -nodes -newkey rsa:2048 -keyout tls.key -out tls.crt \ -subj “/C=CN/ST=Shandong/L=Qingdao/O=Nokia/OU=RD Team/CN=deskshell.com” A very good reference material can be found in digital ocean as below openssl essentials