Files > 500GB have lock and then won't resume

[David]

When transferring files of large sizes the server appears to lock the file out and then won't allow you to write to it again.

No AV is install on the system and everything is allowed through the firewall. It will resume normally but after a point it stops resuming and gives a "550 Writing to file failed" in the log. Permissions to the file and everything are okay and deleting the file and starting again gets it uploading again but it inevitably fails.

Currently attempting to change block size to see if this helps with the problem. The file in question is almost a terabyte in size.

[David]

Copy of relevant portion of server logs

[David]

This forum thread is an example of another user having the same problem as I am, ​https://forum.filezilla-project.org/viewtopic.php?t=42655

[Tim Kosse]

Either a sever bug in Windows itself or alternatively there must be a third-party software installed on your machine that is interfering with file operations.

[David]

There is 2 applications installed on the server, things that might interfere with file operations have been disabled and turned off. This works without a problem with most files but just occurs for larger files.

What sort of evidence do you need me to collect to take me seriously about this? I'm am on the point of setting up a dev environment to try and figure it out myself.