Transfer aborted

Been using SmartFTP for a long time. Starting a few days ago, particular files I update will not upload. This is happening on 4 different computers I work on.

EXAMPLE:
STOR wizard_backgrounds.asp
125 Data connection already open; Transfer starting.
25474 bytes sent successfully. (24.88 KB/s) (00:00:01).
426 Connection closed; transfer aborted.

I would say it's time you purchase a license.

Regards,
SmartFTP