What does these messages mean

[Paul Rijke]

For some reason I get these messages in my logs. What wrong? Everythings
seems to work fine!

Oct 14 07:56:09 sloterdijk PAM_pwdb[11029]: 1 authentication failure;
(uid=0) -> paul for samba service
Oct 14 07:56:30 sloterdijk PAM_pwdb[11031]: 1 authentication failure;
(uid=0) -> paul for samba service
Oct 14 08:04:08 sloterdijk PAM_pwdb[11052]: 1 authentication failure;
(uid=0) -> groot for samba service
Oct 14 08:04:50 sloterdijk PAM_pwdb[11061]: 1 authentication failure;
(uid=0) -> groot for samba service
Oct 14 08:06:57 sloterdijk PAM_pwdb[11062]: 1 authentication failure;
(uid=0) -> boers for samba service