That makes no sense, what question is As I know the sub-files were more than 1000. supposed to answer? What do you get when you make  Debug => 0 something like 9999999?

Q: Firewall?

A: As I know the sub-files were more than 1000.

Q: Can you manually do the FTP from the command-line on each box?

A: As I know the sub-files were more than 1000.