we are running a Axway Synchrony Gateway at our site. Some of our customers have have issues when they try to upload a 0 byte file using FTPS and WinSCP. The transfers gets interrupted, which means in Synchrony Gateway that it has not completed successfully.
We have already opened a support request at Axway. The support people have looked at the issue. They have compared curl with WinSCP and have found out, that WinSCP closes the data connection too early causing an incomplete transfer in Synchrony Gateway.
Are you interested in the details of that problem? I have it available as a PDF document.
Thanks and regards,