I've spent many days trying to resolve this with info from documentation, forums, google at large. I signed up to post my issue downloading a file via FTPS w Explicit TLS Encryption (Data and Control) and encountered an unexpected different issue.
Successful Connection via CoreFTP GUI, directories/files are visible:
Welcome to Core FTP, release ver 2.2, build 1796 (x64) -- © 2003-2014
WinSock 2.0
Mem -- 8,388,152 KB, Virt -- 137,438,953,344 KB
Started on Wednesday April 30, 2014 at 16:42:PM
Resolving [DNS]...
Connect socket #820 to [IP], port [PORT]...
220 SecurePortal2000 FTP_Mailbox Server Build 3.2 ready. 20140430164302
AUTH TLS
234 Command OK.
TLSv1, cipher TLSv1/SSLv3 (DHE-RSA-AES256-SHA) - 256 bit
USER [USERNAME]
331 Password required.
PASS **********
230 Login successful.
SYST
502 SYST command not implemented.
Keep alive off...
PWD
257 "/" is current directory
PBSZ 0
200 Command OK.
PROT P
200 Command OK.
PASV
227 Entering Passive Mode ([IP])
LIST
Connect socket #864 to [IP], port [PORT]...
TLSv1, cipher TLSv1/SSLv3 (DHE-RSA-AES256-SHA) - 256 bit
150 Opening ASCII mode data connection.
226 Transfer complete.
Transferred 207 bytes in 0.011 seconds
CWD /archive
250 CWD command successful.
PASV
227 Entering Passive Mode ([IP])
LIST
Connect socket #884 to [IP], port [PORT]...
TLSv1, cipher TLSv1/SSLv3 (DHE-RSA-AES256-SHA) - 256 bit
150 Opening ASCII mode data connection.
226 Transfer complete.
Transferred 840 bytes in 0.017 seconds
QUIT
221 Goodbye.
Successful Connection via FileZilla GUI directories/files visible:
FileZilla
16:45:52 Status: Resolving address of [SITE]
16:45:52 Status: Connecting to [IP:PORT]...
16:45:52 Status: Connection established, waiting for welcome message...
16:45:52 Response: 220 SecurePortal2000 FTP_Mailbox Server Build 3.2 ready. 20140430164551
16:45:52 Command: AUTH TLS
16:45:52 Response: 234 Command OK.
16:45:52 Status: Initializing TLS...
16:45:52 Status: Verifying certificate...
16:45:52 Command: USER [USERNAME]
16:45:52 Status: TLS/SSL connection established.
16:45:52 Response: 331 Password required.
16:45:52 Command: PASS **********
16:45:52 Response: 230 Login successful.
16:45:52 Command: PBSZ 0
16:45:52 Response: 200 Command OK.
16:45:52 Command: PROT P
16:45:52 Response: 200 Command OK.
16:45:52 Status: Connected
16:45:52 Status: Retrieving directory listing...
16:45:52 Command: CWD /archive
16:45:52 Response: 250 CWD command successful.
16:45:52 Command: TYPE I
16:45:52 Response: 200 Type set to I.
16:45:52 Command: PASV
16:45:53 Response: 227 Entering Passive Mode ([IP])
16:45:53 Command: LIST
16:45:53 Response: 150 Opening BINARY mode data connection.
16:45:53 Response: 226 Transfer complete.
16:45:53 Status: Directory listing successful
Connection successfully made but directories/files unavailable in GUI
--------------------------------------------------------------------------
WinSCP Version 5.5.3 (Build 4214) (OS 6.3.9600 - Windows Server 2012 R2 Standard)
Time zone: Current: GMT-4, Standard: GMT-5 (Eastern Standard Time), DST: GMT-4 (Eastern Daylight Time), DST Start: 3/9/2014, DST End: 11/2/2014
Login time: Wednesday, April 30, 2014 5:36:41 PM
--------------------------------------------------------------------------
Session name: [NAME] (Modified site)
Host name: [SITE] (Port: [PORT])
User name: [USER] (Password: Yes, Key file: No)
Tunnel: No
Transfer Protocol: FTP
Ping type: -, Ping interval: 30 sec; Timeout: 15 sec
Proxy: none
Send buffer: 262144
FTP: FTPS: Explicit TLS; Passive: Yes [Force IP: A]; MLSD: A [List all: A]
Session reuse: Yes
TLS/SSL versions: SSLv3-TLSv1.2
Local directory: default, Remote directory: /inbox/, Update: No, Cache: Yes
Cache directory changes: Yes, Permanent: Yes
DST mode: 1; Timezone offset: 0h 0m
--------------------------------------------------------------------------
Connecting to [SITE:PORT] ...
Connected with [SITE:PORT], negotiating TLS connection...
220 SecurePortal2000 FTP_Mailbox Server Build 3.2 ready. 20140430173641
AUTH TLS
234 Command OK.
Verifying certificate for "[SITE]" with fingerprint [FINGERPRINT]
Certificate for "DB" matches cached fingerprint
Using TLSv1, cipher TLSv1/SSLv3: DHE-RSA-AES256-SHA, 1024 bit RSA
TLS connection established. Waiting for welcome message...
USER [USER]
331 Password required.
PASS ***************
230 Login successful.
SYST
502 SYST command not implemented.
FEAT
550 Syntax error
PBSZ 0
200 Command OK.
PROT P
200 Command OK.
Connected
--------------------------------------------------------------------------
Using FTP protocol.
Doing startup conversation with host.
PWD
257 "/" is current directory
Changing directory to "/inbox/".
CWD /inbox/
250 CWD command successful.
Getting current directory name.
PWD
257 "/inbox" is current directory
Retrieving directory listing...
TYPE A
200 Type set to A.
PASV
227 Entering Passive Mode (160,83,77,211,240,124)
LIST -a
552 Syntax error.
Could not retrieve directory listing
LIST with -a failed, walling back to pure LIST
Retrieving directory listing...
TYPE A
200 Type set to A.
PASV
227 Entering Passive Mode (160,83,77,211,240,125)
LIST
150 Opening ASCII mode data connection.
TLS connection established
-r-------- [USER] [SIZE] [DATE] [FILE]
226 Transfer complete.
Directory listing successful
..;D;0;1899-12-30T05:00:00.000Z;"" [0];"" [0];---------;0
Startup conversation with host finished.
I was pretty amazed to see the log actually list the directories/files, however I still can't 1) see them in the GUI 2) GET them.
Thanks, I hope I've provided enough information.