How to improve provide the right efficiency-vulnerability warning-the black bar safety net

One: detect what site the server is opened 3 3 8 9 remote terminal Two: test whether the service is used serv-u and what version. Method A: copy one site with 3 3 8 9 landers connection it is successfully able to connect, win Server probability, increased by 3 0%. Two: with the ftp mode to check...