{
  "action": "deny",
  "target": {
    "ipv4_connection": {
      "protocol": "tcp",
      "src_port": 21
    }
  },
  "args": {
    "slpf": {
      "drop_process":  "false_ack",
      "direction": "egress"
    }
  },
  "actuator": {
    "slpf": {}
  }
}