config server firewall

Hi

I've installed Proxmox 2.3
I use config server firewall on main server.
But I have a problem.

In syslog, I have a lot of lines :
# Apr 15 15:28:57 vps004 kernel: Firewall: *UDP_OUT Blocked* IN= OUT=vmbr0 SRC=SERVER.IP DST=239.192.186.15 LEN=147 TOS=0x00 PREC=0x00 TTL=1 ID=0 DF PROTO=UDP SPT=5404 DPT=5405 LEN=127

when I add IP 239.192.186.15 to csf.allow, lines change to :
# Apr 15 15:34:20 vps004 kernel: Firewall: *UDP_IN Blocked* IN=vmbr0 OUT= MAC= SRC=188.165.214.157 DST=239.192.186.15 LEN=147 TOS=0x00 PREC=0x00 TTL=1 ID=0 DF PROTO=UDP SPT=5404 DPT=5405 LEN=127

I try to add this
udp|in|s=239.192.186.15
udp|out|s=239.192.186.15

And this
udp|in|d=5404|s=239.192.186.15
udp|in|d=5405|s=239.192.186.15
udp|out|d=5404|s=239.192.186.15
udp|out|d=5405|s=239.192.186.15



But always same error, every 1 or 2 seconds.

If you know how to stop this... It would be very usefull.
Thanks for your help