SSL: error:0B080074:x509 certificate routines:X509_check_private_key:key values mismatch

I'm not able to setup SSL. I've Googled and I found a few solutions but none of them worked for me. I need some help please... Here's the error I get when I attempt to restart nginx: root@s17925268:~# service nginx restart Restarting nginx: nginx: [emerg] SSL_CTX_use_PrivateKey_file("/etc/nginx/conf.d/ssl/ssl.key") failed (SSL: error:0B080074:x509 certificate routines:X509_check_private_key:key values mismatch) nginx: configuration file /etc/nginx/nginx.conf test failed My certificate is from StartSSL and is valid for 1 year. Here's what I tested: - The certificate and private key has no trailing spaces. - I'm not using the default server.key file. - I checked the nginx.conf and the directives are pointing to the correct private key and certificate. I also checked the modulus, and I get a different modulus for both key and certificate.