11.1.22 Could not determine file size (550)

All my uploads are failing. I can get to the ftp via other programs (filezilla, etc…). When I click the Test button I get this:

[DSt-2:1103#12] Failed to upload “C:\windows\TEMP\SqlBakTestFile.back” file.> Could not determine file size (550).

Hello,

Could you please try to upload a backup file to that folder via Rebex FTP Test Client https://www.dropbox.com/s/rsnf5o0y4uhyld5/RebexFtpClient.zip?dl=0