what is the multicast doing on

On my debian server (squeeze) I get this message every few seconds:

Sep 18 21:28:14 myhost kernel: [7903784.720091] AIF:UNPRIV connect attempt: IN=eth0 OUT= MAC= SRC=my_serverip_eth0 DST= LEN=72 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=UDP SPT=5353 DPT=5353 LEN=52

the packets are coming from inside my server (i replaced it with my_serverip_eth0) and seem to be blocked going out to the destination

So some task inside my server is contacting and this is blocked by my arnos_firewall.

How can I find out who or which task is trying to do that and if it is useful or not?

And if I don’t need it, how can I suppress that message then?

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