My latest attempt:
Resolving host name 69.11.210.138...
Connecting to (69.11.210.138) -> IP: 69.11.210.138 PORT: 2001
Connected to (69.11.210.138) -> Time = 234ms
Socket connected waiting for login sequence.
220 Serv-U FTP Server v4.1 for WinSock ready...
USER StankServer
331 User name okay, need password.
PASS (hidden)
230 User logged in, proceed.
SYST
215 UNIX Type: L8
FEAT
211-Extension supported
MDTM
MDTM YYYYMMDDHHMMSS[+-TZ] filename
SIZE
SITE PSWD;EXEC;SET;INDEX;ZONE;CHMOD;MSG
REST STREAM
211 End
Detected Server Software: Serv-U 4.x
PWD
257 "/" is current directory.
TYPE A
200 Type set to A.
PASV
227 Entering Passive Mode (69,11,210,138,6,79)
Opening data connection IP: 69,11,210,138,6,79 PORT: 1615.
The operation completed successfully.
Connecting IP Repeater "repeater.smartftp.com" ...
IP Repeater returned: "68.72.208.156"
PORT 68,72,208,156,6,86
200 PORT Command successful.
Opening data connection IP: 68.72.208.156 PORT: 1622.
LIST -aLT
150 Opening ASCII mode data connection for /bin/ls.
Connection closed. Server timeout.
426 Data connection closed, transfer aborted.
421 Connection timed out - closing.
Connection closed.