There are two common reasons why FTP could not be working correctly.
1. If the connection stalls or errors in most cases, PASV or passive mode
in the FTP software is not turned on.
When dealing with a server that has a firewall, the client will not accept requests forced on to it by the server. This is considered a breach. Instead, in Passive Mode, the client will continuously ask for data and retrieve it. In some cases, with Cute FTP, Passive Mode must be unchecked and checked again to work properly.
2. Check the connection speed