Disable SSLv3, TLS1 and TLS1.1

I’m trying to figure out how to disable SSLv3, TLS1 and TLS 1.1 and force clients to use TLS1.2. I’ve modified the ssl.conf file in /etc/httpd/conf.d/ but SSLv3 is still showing as enabled in NMAP. my ssl.conf file has the following lines (which I found on a general Apache guide for enforcing TLS 1.2)

SSLCipherSuite HIGH:!aNULL:!MD5:!3DES
SSLHonorCipherOrder on
SSLProtocol all -SSLv2 -SSLv3 -TLSv1 -TLSv1.1

Does Libre have its own configuration file to set these parameters? Please let me know what other information you need from me.

Thanks in advance!

If you use Apache, then Apache settings are the one you need to tweak, you are correct. LibreNMS is just “another website” from Apache point of view.
I am not aware of this particular setting specific issue, but Apache config can be split into multiple files usually, so you may have conflicting settings, site-specific settings, distribution specific, etc etc. You definitely need to ask on an Apache forum where you’ll find more answers.