[Mystic]
unable to open data connection, doesn't get the qwk packet:

Nov 23 11:02:02 QWKPOLL Startup (v1.12 A47 Linux/64 Compiled 2020/10/23 21:23:46)
Nov 23 11:02:02 Exchanging Mail for DOVE-Net
Nov 23 11:02:02 Exported @athel.rep -> 0 msgs
Nov 23 11:02:02 Connecting via FTP to athel.synchro.net
Nov 23 11:02:03 R:220-Athelstan BBS (athelstan.org)
Nov 23 11:02:03 Connected
Nov 23 11:02:03 Local IP is 138.124.183.99
Nov 23 11:02:03 S:USER DESTINY
Nov 23 11:02:03 R:331 User name okay, need password.
Nov 23 11:02:03 S:PASS <not shown>
Nov 23 11:02:03 R:230-DESTINY logged in.
Nov 23 11:02:03 S:TYPE I
Nov 23 11:02:03 R:200 All files sent in BINARY mode.
Nov 23 11:02:03 S:MODE S
Nov 23 11:02:03 R:200 STREAM mode.
Nov 23 11:02:03 Logged in as DESTINY
Nov 23 11:02:03 Downloading QWK packet
Nov 23 11:02:03 S:PASV
Nov 23 11:02:03 R:227 Entering Passive Mode (107,161,31,121,4,0)
Nov 23 11:02:03 S:RETR athel.qwk
Nov 23 11:02:13 Unable to open data connection

It does work sometimes, here's the last time it did and what the qwkpoll.log looks like:

Nov 23 00:31:20 QWKPOLL Startup (v1.12 A47 Linux/64 Compiled 2020/10/23 21:23:4>
Nov 23 00:31:20 Exchanging Mail for DOVE-Net
Nov 23 00:31:20 Exported @athel.rep -> 0 msgs
Nov 23 00:31:20 Connecting via FTP to athel.synchro.net
Nov 23 00:31:21 R:220-Athelstan BBS (athelstan.org)
Nov 23 00:31:21 Connected
Nov 23 00:31:21 Local IP is 138.124.183.99
Nov 23 00:31:21 S:USER DESTINY
Nov 23 00:31:21 R:331 User name okay, need password.
Nov 23 00:31:21 S:PASS <not shown>
Nov 23 00:31:21 R:230-DESTINY logged in.
Nov 23 00:31:21 S:TYPE I
Nov 23 00:31:21 R:200 All files sent in BINARY mode.
Nov 23 00:31:21 S:MODE S
Nov 23 00:31:21 R:200 STREAM mode.
Nov 23 00:31:21 Logged in as DESTINY
Nov 23 00:31:21 Downloading QWK packet
Nov 23 00:31:21 S:PASV
Nov 23 00:31:21 R:227 Entering Passive Mode (107,161,31,121,4,0)
Nov 23 00:31:21 S:RETR athel.qwk
Nov 23 00:31:29 R:150 Opening BINARY mode data connection for file transfer.
Nov 23 00:31:29 R:226 Download complete (100554 cps).
Nov 23 00:31:29 OK: athel.qwk (50,277 bytes)
Nov 23 00:31:29 Importing QWK packet:
Nov 23 00:31:29 Imported 158 messages (0 failed)

Mystic Event-
Active      : Yes
Event Type  : Interval
Exec Hour   : 2
Exec Min    : 0
Shell       : ./qwkpoll all
Sun-Sat     : Yes


[Synchronet] - QWK HUB
Nov 23 11:02:02 nemesis sbbs: 11/23 11:02:02 ftp  0075 CTRL connection accepted from: 138.124.183.99 port 40520
Nov 23 11:02:03 nemesis sbbs: 11/23 11:02:03 ftp  0075 Hostname: nyx.zirak.org [138.124.183.99]
Nov 23 11:02:03 nemesis sbbs: 11/23 11:02:03 ftp  0075 <DESTINY> logged in (7 today, 383 total)
Nov 23 11:02:03 nemesis sbbs: 11/23 11:02:03 ftp  0075 <DESTINY> creating QWK packet...
Nov 23 11:02:13 nemesis sbbs: 11/23 11:02:13 ftp  0075 <DESTINY> downloading QWK packet (22171 bytes) in passive mode
Nov 23 11:02:13 nemesis sbbs: 11/23 11:02:13 ftp  0075 <DESTINY> DATA Transfer successful: 22171 bytes sent in 0 seconds (44342 cps)
Nov 23 11:02:13 nemesis sbbs: 11/23 11:02:13 ftp  0075 <DESTINY> logged off
Nov 23 11:02:13 nemesis sbbs: 11/23 11:02:13 ftp  0075 CTRL thread terminated (0 clients and 1 threads remain, 111 served)

I tried from the same host, using my test user account and this way worked but letting the mystic even run, or even running ./qwkpoll all ends up with the Unable to make data connection, leading me to believe this to be a Mystic problem. From the Mystic bbs, right above to my test user below, both appear successful to Synchronet.

Nov 23 14:11:21 nemesis sbbs: 11/23 14:11:21 ftp  0075 CTRL connection accepted from: 138.124.183.99 port 40544
Nov 23 14:11:21 nemesis sbbs: 11/23 14:11:21 ftp  0075 Hostname: nyx.zirak.org [138.124.183.99]
Nov 23 14:11:28 nemesis sbbs: 11/23 14:11:28 ftp  0075 <baumellex> logged in (2 today, 27 total)
Nov 23 14:12:16 nemesis sbbs: 11/23 14:12:16 ftp  0075 <baumellex> creating QWK packet...
Nov 23 14:12:46 nemesis sbbs: 11/23 14:12:46 ftp  0075 <baumellex> downloading QWK packet (4742385 bytes) in passive mode
Nov 23 14:12:46 nemesis sbbs: 11/23 14:12:46 ftp  0075 <baumellex> DATA Transfer successful: 4742385 bytes sent in 0 seconds (9484770 cps)
Nov 23 14:12:54 nemesis sbbs: 11/23 14:12:54 ftp  0075 <baumellex> logged off
Nov 23 14:12:54 nemesis sbbs: 11/23 14:12:54 ftp  0075 CTRL thread terminated (0 clients and 1 threads remain, 161 served)

here's from running ftp on the mystic server side:

ftp> passive
Passive mode on.
ftp> get athel.qwk
local: athel.qwk remote: athel.qwk
227 Entering Passive Mode (107,161,31,121,4,0)
150 Opening BINARY mode data connection for file transfer.
226 Download complete (9484770 cps).
4742385 bytes received in 0.87 secs (5.2010 MB/s)
ftp> quit
221 Goodbye. Closing control connection.
mystic@nyx:/mystic/logs$ ls -alh athel.qwk
-rw-rw-r-- 1 mystic mystic 4.6M Nov 23 14:12 athel.qwk