The server tries to open a connection back to your computer. Modern firewalls and routers almost always block this, resulting in a created file name but no data inside.
Your client opens the connection to the server. This is much more firewall-friendly. ftp download 0 byte file
If the network drops for even a millisecond during the initial "MDTM" (File Modified Time) or "SIZE" command check, the client might think the transfer is finished before it actually starts. The server tries to open a connection back to your computer
Check the file permissions on the server. For most web files, 644 is the standard for successful reading. 4. Firewall and Antivirus Interference ftp download 0 byte file
Try a like SFTP (Port 22), which handles firewalls much better than standard FTP.