Folder, \Data\ExportService\Data\DataExports, had built up too many files to be gathered by the script before it timed-out.
Solution:
- Test the solution my manually move old files to another folder to test the solution, leaving just a few hundred.
- Once the solution is confirmed, then fix the cleanup script
Example FTP commands
/Data/Logs$ PASV
227 Entering Passive Mode (198,107,132,38,166,222).
/Data/Logs$ LIST *.log
150 Opening BINARY mode data connection.
550 Data channel timed out.