--- squid.inc.ori       2010-09-17 12:19:29.000000000 -0400
+++ squid.inc   2010-09-17 12:53:28.000000000 -0400
@@ -1266,6 +1266,7 @@
                                foreach ($ifaces as $iface) {
                                        $rules .= "no rdr on $iface proto tcp from any to { 192.168.0.0/16, 172.16.0.0/12, 10.0.0.0/8 } port 80\n";
                                }
+                       $rules .= "no rdr on \$pptp proto tcp from any to { 192.168.0.0/16, 172.16.0.0/12, 10.0.0.0/8 } port 80\n";
                        }
                        if (!empty($squid_conf['defined_ip_proxy_off'])) {
                                $defined_ip_proxy_off = explode(";", $squid_conf['defined_ip_proxy_off']);