Converting the SSL Certificate Format is a cakewalk now!
What happens sometimes is, your CA may have sent you the SSL certificate file in a format that is not supported on your server. For this, you need to modify the file format of your certificate. This can be quickly and easily done. All you need to do is run some OpenSSL commands as listed below.
OpenSSL commands to convert PEM file
Convert PEM to DER
openssl x509 -outform der -in certificate.pem -out certificate.der