I have seen a lot of threads about this error, none of the solutions worked. Here is the solution.
nginx: [warn] the "ssl" directive is deprecated, use the "listen ... ssl" directive instead in /etc/conf.d/vhosts/yourdomain.tld.ssl.conf:8
listen xxx.yyy.zzz.vvv:443 ;
server_name web01.saadhost.com ;
access_log /usr/local/apache/domlogs/web01.saadhost.com.bytes bytes;
access_log /usr/local/apache/domlogs/web01.saadhost.com.log combined;
error_log /usr/local/apache/domlogs/web01.saadhost.com.error.log error;
Line 8 is –
The solution is simple.
Remove Line 8 (ssl on)
Modify Line 2 by adding “ssl” as marked in red:
listen xxx.yyy.zzz.vvv:443 ssl ;
Do this in all .ssl.conf files, as well as in the conf.d/hostname-ssl.conf file
Then restart the server and the error will be gone.
Bonus tip: Turning On HTTP/2
If you are already doing this, and your server is set up, you can turn on HTTP/2 at the same time and increase your site speed.
listen xxx.yyy.zzz.vvv:443 ssl http2 ;