iam using the Crossftp client from http://www.crossftp.com/ (yes, it has PRET support!)
iam connecting to drftpd-2.1-Dev revision 1839. the same client with drftpd2.0+ is working very well.

withouth TLS/SSL:
[L] LIST -al
[L] 150 File status okay; about to open data connection.
[L] 226- [Ul: 0B] [Dl: 1.8MB] [Average speed: 1.4KB] 
[L] 226-      [Credits: 0B] [Ratio: 1:0.0]
[L] 226 Closing data connection
[L] PRET RETR /0day/1019/Web.xxxxxxxxxx-iNViSiBLE/file_id.diz
[L] 200 OK, planning for upcoming download
[L] PASV
[L] 227- Using eta for upcoming transfer
[L] 227 Entering Passive Mode (80,255,85,128,209,195).
[L] Opening data connection IP: 80.255.85.128 PORT: 53699
[L] RETR /0day/1019/Web.xxxxxxxxxx-iNViSiBLE/file_id.diz
[L] 503 Bad sequence of commands.
[L] Bad sequence of commands.
[L] Wait and retry at attempt #1


with TLS/SSL
[L] CWD /0day/1019/Web.xxxxxxxxxx-iNViSiBLE
[L] 250 Directory changed to /0day/1019/Web.xxxxxxxxxx-iNViSiBLE
[L] PRET LIST 
[L] 200 OK, planning to use master for upcoming LIST transfer
[L] PASV
[L] 227- Using master for upcoming transfer
[L] 227 Entering Passive Mode (80,255,85,128,234,211).
[L] Opening data connection IP: 80.255.85.128 PORT: 60115
[L] LIST -al
[L] 150 File status okay; about to open data connection.
[L] 226- [Ul: 0B] [Dl: 486B] [Average speed: 1B] 
[L] 226-      [Credits: 0B] [Ratio: 1:0.0]
[L] 226 Closing data connection
[L] PRET RETR /0day/1019/Web.xxxxxxxxxx-iNViSiBLE/file_id.diz
[L] 200 OK, planning for upcoming download
[L] PASV
[L] 227- Using zion for upcoming transfer
[L] 227 Entering Passive Mode (91,255,77,9,131,22).
[L] Opening data connection IP: 91.255.77.9 PORT: 33558
[L] RETR /0day/1019/Web.xxxxxxxxxx-iNViSiBLE/file_id.diz
[L] 503 Bad sequence of commands.
[L] Bad sequence of commands.
[L] Wait and retry at attempt #1
[L] PRET RETR /0day/1019/Web.xxxxxxxxxx-iNViSiBLE/file_id.diz
[L] 200 OK, planning for upcoming download
[L] PASV
[L] 227- Using kappa for upcoming transfer
[L] 227 Entering Passive Mode (91,255,81,117,211,13).
[L] Opening data connection IP: 91.255.81.117 PORT: 54029
[L] REST 0
[L] 350 Requested file action pending further information.
[L] RETR /0day/1019/Web.xxxxxxxxxx-iNViSiBLE/file_id.diz
[L] 503 Bad sequence of commands.
[L] Bad sequence of commands.
[L] Wait and retry at attempt #2