i have tested on the serv-u from a friend
[+] Send shellcode 794 bytes.
[+] If you don't have a shell it didn't work.
there is no shell only a crashed pc and an angry friend

that mean there is no shell
still testing
P.S.
[+] Connect to ***.**.*.***:21 success.
[-] Bind port on ***.**.**.**:666 error. <-- my ip with nc port
[-] You must run nc get the shell.
i don't no why the exploit can't bind the port on my pc