---- Resolving host address...
---- 1 address found: 185.125.224.238
---- Connecting to ftp.nai.com (185.125.224.238) port 21
<--- 220----------------------------------------------------------------------------
<--- 220- WARNING: This is a restricted access system. If you do not have explicit
<--- 220- permission to access this system, please disconnect immediately!
<--- 220-----------------------------------------------------------------------------
<--- 220
---> USER
<--- 331 Please specify the password.
---> PASS
<--- 230 Login successful.
---> PWD
<--- 257 "/" is the current directory
---> PORT 173,212,196,208,201,147
<--- 500 Illegal PORT command.
---- Switching passive mode on
---> NLST
---> ABOR
---- Closing aborted data socket
---- Closing control socket