Download OpenSSL and install the files.
In the console on your server enter the following:
# create the key
openssl genrsa -out key.pem 2048
# only on LINUX/UNIX systems
# chmod 600 key.pem
# Add the properties
openssl req -new -key key.pem -out csr.pem # Here come the questions by country, province, name, etc.
# You can sign your csr by yourself to test SSL on your server
openssl x509 -req -days 3650 -in csr.pem -signkey key.pem -out crt.pem
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