FTPS via AUTH TLS Failed

[kau-vlin]

From one of our Windows servers behind corporate Firewall, I use our newly purchased coreFTP Pro Client to try to connect to a Remote FTP Host.
Port=20017 (as specified by the remote ftp host)
PASV - I had tried this setting both PASV=ON or OFF.
Connection = AUTH TLS
Checked ON for: SSL Listings, SSL Transfer & Windows SSL.
The first time I tried to connect, it displayed a panel of Certificate Information from the remote ftp host, and I clicked on the "Always Accept".
In subsequent attempts, I also went into the Advanced Site Settings - SSL/TLS and checked ON the "Allow session reuse".
However, my numerous attempts all failed.
Typical error messages as shown below:

Welcome to Core FTP, release ver 2.2, build 1912 (x64) -- © 2003-2017
WinSock 2.0
Mem -- 4,193,780 KB, Virt -- 137,438,953,344 KB
Started on Wednesday February 07, 2018 at 21:13:PM
Resolving <remote-ftp-host-dnsname> ...
Connect socket #1012 to <remote-ftp-host-IP>, port 20017...
220 XXX XXX FTP Server
AUTH TLS
234 Using authentication type TLS
USER ftpuser
331 Password required for ftpuser
PASS **********
230 Logged on
SYST
215 UNIX emulated by FileZilla
Keep alive off...
PWD
257 "/" is current directory.
PBSZ 0
200 PBSZ=0
PROT P
200 Protection level set to P
PORT 10,64,26,230,49,20
200 Port command successful
LIST
150 Opening data channel for directory listing of "/"
425 Can't open data connection for transfer of "/"
Attemping PASV mode transfer...
PASV
227 Entering Passive Mode (172,31,120,157,19,161)
172.31.120.157 -> <remote-ftp-host-IP>
LIST
Connect socket #1644 to <remote-ftp-host-IP>, port 5025...
No response from server.
SSL failed
Connection terminated
Error loading directory...

Please help.

[ForumAdmin]

advanced -> SSL/TLS -> allow session reuse

[kau-vlin]

Hi,
I had already turned ON the advanced -> SSL/TLS -> Allow session reuse, but still got the error.

[ForumAdmin]

You may need to put the remote-ftp-host-IP value in your site profile -> advanced -> connections -> use NAT host/IP