Number of times to retry if FTP server busy. 

If the FTP server is busy try to reconnect for the specified number of times. The FTP connection timeout will be respected on each retry.

Delay between retries (seconds). 

Wait for the specified number of seconds before retrying on a busy server. This is useful to prevent hammering the FTP server.

FTP connection timeout. 

Consider the connection to a FTP server has timed out after the specified number of seconds.

FTP connection read timeout. 

Consider the connection to a FTP server has timed out after not being able to read from the connected FTP server for the specified number of seconds.