Depending on your router or network configuration, you might need to use a proxy in order to make unencrypted FTP connections from FileZilla/FileZilla Pro.
To configure FileZilla/FileZilla Pro to use an FTP proxy:
- In the main menu, click on Edit > Settings….
- Select Connection > FTP > FTP Proxy from the menu on the left.
- Select the type of FTP proxy available.
- Enter the proxy address and login details.
- Click on OK.