TLS1.2 is required to pass certain PCI compliance scans, otherwise the compliance fails. This article explains which TLS version is supported on SRX.
Which version of TLS is supported on SRX?
TLS 1.2 is supported beginning with Junos 12.3X48-D30 and later. This also includes Junos 15.1X49-D10 and later. SRX platform that is running earlier Junos versions support up to TLS 1.0.