Specify a comma separated list of SSL/TLS protocol versions to allow. For example, to enable TLS 1.1, TLS 1.2, and TLS 1.3, specify TLSv1.1, TLSv1.2, and TLSv1.3. Likewise, to enable all versions of SSL/TLS, specify SSLv3,TLSv1,TLSv1.1,TLSv1.2 or TLSv1.3..