A successful FTP login followed by a directory listing failure often points to a data connection problem.
Use passive mode
Passive mode is usually more compatible with clients behind NAT. Confirm the FTP server exposes the configured passive port range through its firewall.
Check encryption and ports
Match FTP, FTPS or SFTP settings to the provider instructions. SFTP uses SSH and is not the same protocol as FTP over TLS.
Read the client log
The FileZilla message log identifies timeout, certificate, authentication and permission errors. Share the relevant error lines with support without exposing passwords.
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