Network error: Software caused connection Abort

We're having trouble connecting to an ftp server. I'm able to connect from another server on the same network, I'm able to connect from my local machine at home. But this one server keeps throwing the error...
Error: Network error: Software caused connection abort
Error: Could not connect to server

I tried re-adding credentials, deleting the SSH record in registry for the site, I even completely uninstalled WinSCP and re-installed, no luck. Then I tried another ftp client, still no luck. I get the same error whether I use the client or the command line.

I'm hoping someone may be able to help out... here is our log...
. 2019-01-16 11:38:39.595 --------------------------------------------------------------------------
. 2019-01-16 11:38:39.595 WinSCP Version 5.11.2 (Build 7781) (OS 10.0.14393 - Windows Server 2016 Datacenter)
. 2019-01-16 11:38:39.595 Configuration: HKCU\Software\Martin Prikryl\WinSCP 2\
. 2019-01-16 11:38:39.595 Log level: Normal
. 2019-01-16 11:38:39.595 Local account: **************************
. 2019-01-16 11:38:39.595 Working directory: C:\Program Files (x86)\WinSCP
. 2019-01-16 11:38:39.595 Process ID: 19076
. 2019-01-16 11:38:39.595 Command-line: "C:\Program Files (x86)\WinSCP\WinSCP.exe" /console=5.11.2 /consoleinstance=_8476_9
. 2019-01-16 11:38:39.595 Time zone: Current: GMT-6, Standard: GMT-6 (Central Standard Time), DST: GMT-5 (Central Daylight Time), DST Start: 3/10/2019, DST End: 11/3/2019
. 2019-01-16 11:38:39.595 Login time: Wednesday, January 16, 2019 11:38:39 AM
. 2019-01-16 11:38:39.595 --------------------------------------------------------------------------
. 2019-01-16 11:38:39.595 Script: Retrospectively logging previous script records:
> 2019-01-16 11:38:39.595 Script: open sftp://******************* -hostkey="ssh-rsa 2048 ****************************"
. 2019-01-16 11:38:39.595 --------------------------------------------------------------------------
. 2019-01-16 11:38:39.595 Session name: **********************(Ad-Hoc site)
. 2019-01-16 11:38:39.595 Host name: **************************** (Port: 22)
. 2019-01-16 11:38:39.595 User name: ********** (Password: Yes, Key file: No, Passphrase: No)
. 2019-01-16 11:38:39.595 Tunnel: No
. 2019-01-16 11:38:39.595 Transfer Protocol: SFTP
. 2019-01-16 11:38:39.595 Ping type: Off, Ping interval: 30 sec; Timeout: 15 sec
. 2019-01-16 11:38:39.595 Disable Nagle: No
. 2019-01-16 11:38:39.595 Proxy: None
. 2019-01-16 11:38:39.595 Send buffer: 262144
. 2019-01-16 11:38:39.595 SSH protocol version: 2; Compression: No
. 2019-01-16 11:38:39.595 Bypass authentication: No
. 2019-01-16 11:38:39.595 Try agent: Yes; Agent forwarding: No; TIS/CryptoCard: No; KI: Yes; GSSAPI: Yes
. 2019-01-16 11:38:39.595 GSSAPI: Forwarding: No
. 2019-01-16 11:38:39.595 Ciphers: aes,chacha20,blowfish,3des,WARN,arcfour,des; Ssh2DES: No
. 2019-01-16 11:38:39.595 KEX: ecdh,dh-gex-sha1,dh-group14-sha1,rsa,WARN,dh-group1-sha1
. 2019-01-16 11:38:39.595 SSH Bugs: Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto
. 2019-01-16 11:38:39.595 Simple channel: Yes
. 2019-01-16 11:38:39.595 Return code variable: Autodetect; Lookup user groups: Auto
. 2019-01-16 11:38:39.595 Shell: default
. 2019-01-16 11:38:39.595 EOL: LF, UTF: Auto
. 2019-01-16 11:38:39.595 Clear aliases: Yes, Unset nat.vars: Yes, Resolve symlinks: Yes; Follow directory symlinks: No
. 2019-01-16 11:38:39.595 LS: ls -la, Ign LS warn: Yes, Scp1 Comp: No
. 2019-01-16 11:38:39.595 SFTP Bugs: Auto,Auto
. 2019-01-16 11:38:39.595 SFTP Server: default
. 2019-01-16 11:38:39.595 Local directory: default, Remote directory: home, Update: Yes, Cache: Yes
. 2019-01-16 11:38:39.595 Cache directory changes: Yes, Permanent: Yes
. 2019-01-16 11:38:39.595 Recycle bin: Delete to: No, Overwritten to: No, Bin path:
. 2019-01-16 11:38:39.595 DST mode: Unix
. 2019-01-16 11:38:39.595 --------------------------------------------------------------------------
. 2019-01-16 11:38:39.595 Looking up host "**********************" for SSH connection
. 2019-01-16 11:38:39.595 Connecting to ************ port 22
. 2019-01-16 11:38:39.595 We claim version: SSH-2.0-WinSCP_release_5.11.2
. 2019-01-16 11:38:39.735 Network error: Software caused connection abort

So is it FTP server or SFTP server? You write about FTP, but connect using SFTP. What protocol are you using on the machines, where you can connect?

Can you connect using any other FTP/SFTP/SSH client from the machine, where WinSCP does not work?