DR software build 4.0.3101.1 and later disables TLS 1.0 and TLS 1.1 and uses only TLS 1.2.
But only for 13G servers (DR4300, DR4300e, DR6300). It is not possible to use TLS 1.2 on older DR appliances based on 11G/12G hardware platforms (DR4000 / DR4100 / DR6000).