lftp -u user,password sftp://xxx.xxxxx.xxxx
lftp user@XXXX.XXXX.XXX:~> ls
ls: Fatal error: pseudo-tty allocation failed: No such file or directory

lftp -u user,password xxx.xxxxx.xxxx
lftp user@xxx.xxxx.xxxx:~> ls
WARNING: failed to configure server name indication (SNI) TLS extension
ls: Login failed: 500 PASS: USER must be sent first

ssh -t USER@XXX.X.XXX.XX "cd /Home/path/dir/"
user@xx.xx.xxx.xxx's password:
PTY allocation request failed on channel 0

curl -u USER:PASS  'ftp://XX.XXX.XXXX/path/To_dir/' -o /tmp/test.file
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (67) Access denied: 500

lftp -u user,password sftp://xxx.xxxxx.xxxx << --EOF--
cd /path/on/remote/server/dir
mput  *
quit
--EOF--