syslogs cluttered by pure-ftp

[Ovidiu]

any idea why my logs are full with clutter like this?
besides, I haven't yet created a single ftp user, not needed yet...

May 7 05:15:02 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 05:20:02 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 05:20:02 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 05:25:01 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 05:25:01 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 05:30:01 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 05:30:01 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 05:35:01 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 05:35:01 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 05:40:02 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 05:40:02 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 05:45:02 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 05:45:02 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 05:50:02 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 05:50:02 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 05:55:02 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 05:55:02 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 06:00:02 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 06:00:02 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 06:05:01 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 06:05:01 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 06:10:01 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 06:10:01 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 06:15:01 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 06:15:01 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 06:20:01 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 06:20:01 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 06:25:01 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 06:25:01 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 06:30:01 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 06:30:01 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 06:35:01 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 06:35:01 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 06:40:01 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 06:40:01 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 06:45:01 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 06:45:01 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 06:50:02 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 06:50:02 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 06:55:02 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 06:55:02 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 07:00:02 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 07:00:02 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 07:05:01 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 07:05:01 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 07:10:02 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 07:10:02 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 07:15:02 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 07:15:02 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 07:20:02 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 07:20:02 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 07:25:02 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 07:25:02 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 07:30:02 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 07:30:02 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 07:35:01 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 07:35:01 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.
May 7 07:40:01 h1550830 pure-ftpd: (?@localhost) [INFO] New connection from localhost
May 7 07:40:01 h1550830 pure-ftpd: (?@localhost) [INFO] Logout.