How to check what SSL/TLS protocols are enabled in Apache configuration

[Suhitha]

Applicable to:

• Plesk for Linux

Question

How to check what SSL/TLS protocols are enabled in Apache configuration?


Answer

SSL/TLS protocols used by Apache are defined by the "SSLProtocol" Apache directive. To check which protocols are allowed:

1.Connect to a Plesk server via SSH.

2.Run the command:

• on CentOS/RHEL-based distributions

# grep SSLProtocol /etc/httpd/conf.d/ssl.conf

SSLProtocol +TLSv1.2

• on Debian/Ubuntu-based distributions

# grep -ir SSLProtocol /etc/apache2/*

/etc/apache2/mods-available/ssl.conf:SSLProtocol +TLSv1.2 +TLSv1.3


To enable/disable SSL/TLS protocols, see this KB article.