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

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Kuzma Ivanov
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kb: how-to Plesk for Linux ABT: Group A

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.

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