- Plesk for Linux
Is it possible to enable TLS 1.2 in Plesk on CentOS 5?
No. CentOS 5 only supports TLS 1.0 for OpenSSL and there is no way to enable it officially. TLS 1.2 is supported starting from CentOS 6. However, there is a way to recompile your applications with another library that is described on the 3rd-party resource. Please note, that all the actions are done at your own risk.
Additionally, CentOS 5 is no longer supported by Plesk, consider migration to supported OS.