I can confirm the file is not in use by any other program on either side of the transfer. Specs: 16-core, 32 GB RAM, volume where the file is being stored has 17.7 TB free space (of 31.9 TB total) It doesn't seem to matter which FTP client I use to make the upload, they all cannot proceed any further. All further attempts at resuming the upload end like this.

The system was able to upload approximately 490 GB of it before suddenly being cut off. The file in question - D_ - is nearly 1 TB in size. I've obfuscated the IP address and username, but everything else is untouched.

However, there appears to be some kind of limiting factor in place.

However, some clients have *great* internet connections and could upload a large file. spf file is too large, we send it via Fedex because it would take too long to send over the internet. spf files - ranging in size from only 20 GB to over 1 TB, just depending on the particular system. I use Filezilla, both client and server, for many things, but one of the important ones is as a FTP server target where backups of some of our clients are sent. I have a recurring problem and I'm hoping someone can point me in the right direction.

Filezilla sftp server size