[Skunkworks] help: squid+dansgaurdian setup compromised.

hey, I have a basic traditional NAT setup of squid+dansguardian on Linux Ubuntu 8.10. Squid as the proxy and dansguardian as the content manager. My network has suddenly started crawling and /var/log/dansguardian/access.log shows foreign IPs riding on my bandwidth and visiting graphic porn sites with impunity. Could someone give pointers on where I need to tighten the configs to keep off the external bad boys and girls (IPs) from the riding my proxy server? walu.