samba - May 2010 - nmbd: Ignoring request packet with opcode 5

Hello,

I have lots of the following entries in my log:

nmbd[1605]: [2010/05/28 09:59:51,  0]
nmbd/nmbd_packets.c:validate_nmb_packet(1375)
nmbd[1605]:   validate_nmb_packet: Bad REG/REFRESH Packet. validate_nmb_packet:
Ignoring request packet with opcode 5.

What does this mean exactly? Can I ignore this? I use samba (sernet-samba)
3.3.12-25 on Debian Lenny.

Thanks and Regards.

Henry