my /var/log/messages is full of messages like:

Jan 29 01:00:02 vm2147 pure-ftpd: (?@::1) [INFO] New connection from ::1
Jan 29 01:00:02 vm2147 pure-ftpd: (?@::1) [INFO] Logout.
Jan 29 01:05:02 vm2147 pure-ftpd: (?@::1) [INFO] New connection from ::1
Jan 29 01:05:02 vm2147 pure-ftpd: (?@::1) [INFO] Logout.

These messages are generated every five minutes. What do they mean and is it a problem? How can i prevent them? My system is 2.6.35.12-90.fc14.x86_64.