WARNING: ftp_nb_fput(): Can’t build data connection

Backing up does not work, see the messages below, any ideas to solve this?

Use explicit SSL-FTP connection. – Unchecked
Use FTP Passive Mode. Unchecked

1. Try to send backup file to an FTP server …
   Connected to FTP server: XXXXXXX.XXXXXXXXX.com:21
   FTP client command: USER XXXXXXXXX
   FTP server response: User XXXXXXXXX logged in.
   FTP client command: SYST
   FTP server reply: UNIX
   FTP current folder is: /XXXXXXX/XXXXXXXX/XXX/
   FTP client command: PASV
   FTP server reply: Entering normal mode
   Starting upload to FTP …
   WARNING: ftp_nb_fput(): Can’t build data connection: Connection timed out.
   ERROR: Cannot transfer backup to FTP server!

Use explicit SSL-FTP connection. – Checked
Use FTP Passive Mode. Unchecked

1. Try to send backup file to an FTP server …
   Connected via explicit SSL-FTP to server: XXXXXXX.XXXXXXXXX.com:21
   FTP client command: USER XXXXXXXXX
   FTP server response: User XXXXXXXXX logged in.
   FTP client command: SYST
   FTP server reply: UNIX
   FTP current folder is: /XXXXXXX/XXXXXXXX/XXX/
   FTP client command: PASV
   FTP server reply: Entering normal mode
   Starting upload to FTP …
   WARNING: ftp_nb_fput(): Can’t build data connection: Connection timed out.
   ERROR: Cannot transfer backup to FTP server!

Use explicit SSL-FTP connection. – Unchecked
Use FTP Passive Mode. Checked

1. Try to send backup file to an FTP server …
   Connected via explicit SSL-FTP to server: XXXXXXX.XXXXXXXXX.com:21
   FTP client command: USER XXXXXXXXX
   FTP server response: User XXXXXXXXX logged in.
   FTP client command: SYST
   FTP server reply: UNIX
   FTP current folder is: /XXXXXXX/XXXXXXXX/XXX/
   FTP client command: PASV
   FTP server reply: Entering normal mode
   Starting upload to FTP …
   WARNING: ftp_nb_fput(): php_connect_nonb() failed: Operation now in progress (115)
   WARNING: ftp_nb_fput(): Entering Passive Mode (192,168,1,64,216,241)
   ERROR: Cannot transfer backup to FTP server!

Thanks in advance