If you are behind a firewall and/or router you often need to use passive FTP to get a stable connection. Just open up the firewall settings dialog by clicking 'Edit' in the menu bar and then 'Settings'. Once the settings window is open click on the 'Firewall Settings' tab on the dialog. You can then check/uncheck 'Passive Mode' if necessary.
If you are behind a firewall and/or router you will need to use Passive mode for FTP to get a stable connection. You can see this setting as is shown bellow:
Open FileZilla and go menu Edit -> Settings. In the Connections section, please click Firewall settings and check the Passive mode option.
