[squid-users] squid-iptables

Hi,

I've configured three squid box with iptables, and all works fine,

squid-box1 -- squid-box2 -- squid-box3 (proxys-cache)

    squid-box4 --- squid-box5 (proxys-filter with squidguard)

but in squid-box4 and box5 with iptables, I've seen in cache.log

 comm_udp_sendto: FD 4, ip-dns-server, port 53: (1) Operation not permitted
2003/08/20 11:21:48| idnsSendQuery: FD 4: sendto: (1) Operation not
permitted

and the connections go stopping slowly until all stop,

what does these lines mean ?,
I will have to enable udp port 53 like src ?

Thanks.
Emilio