Seems like they are using *IMPLICIT on their SSL connection.
So you can connect, but the AUTHTLS command fails as they are using a cipher suite that you do not support. Call them and find out what cipher suites they support and make sure it is in your system value.
The following command on your iSeries should work:
FTP RMTSYS('184.108.40.206') PORT(21) SECCNN(*SSL)
Director of Information Services
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Art Duarte
Sent: Thursday, September 03, 2015 10:08 AM
To: Midrange Systems Technical Discussion
Subject: RE: FTPS Error
Yes, Filezilla works fine with the info given.
Does not connect using telnet
I did the following command
open 220.127.116.11 21
Message received: Failed to connect
telnet 18.104.22.168 21
Got a telnet window with message "220 22.214.171.124 FTP server ready"
I typed status, and got the 550 SSL/TLs required on the control channel
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