I am having a hard time resolving a problem with my squid configuration.  99% of the websites I visit work just fine but geekzone.co.nz gives me a Bad request (HTTP 400) error.  My internet traffic is being routed through squid on my server.  If I bypass squid I can access the site without problems.

Error in squid access.log: TCP_MISS/400 329 GET http://www.geekzone.co.nz/default.asp - DIRECT/ text/html

Here is my squid.conf
acl manager proto cache_object
acl localhost src
acl to_localhost dst
acl SSL_ports port 443
acl Safe_ports port 80 # http
acl Safe_ports port 21 # ftp
acl Safe_ports port 443 # https
acl Safe_ports port 70 # gopher
acl Safe_ports port 210 # wais
acl Safe_ports port 1025-65535 # unregistered ports
acl Safe_ports port 280 # http-mgmt
acl Safe_ports port 488 # gss-http
acl Safe_ports port 591 # filemaker
acl Safe_ports port 777 # multiling http
acl Safe_ports port 901 # SWAT
acl purge method PURGE
http_access allow manager localhost
http_access deny manager
http_access allow purge localhost
http_access deny purge
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
acl our_networks src
http_access allow our_networks
http_access allow localhost
http_access deny all
icp_access allow all
http_port 3128 transparent
hierarchy_stoplist cgi-bin ?
acl QUERY urlpath_regex cgi-bin \?
cache deny QUERY
access_log /var/log/squid/access.log squid
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern . 0 20% 4320
acl apache rep_header Server ^Apache
forwarded_for off
coredump_dir /var/cache/squid
visible_hostname *********
url_rewrite_children 10
debug_options ALL,2

Here is my shorewall/start

#Allow direct access to geekzone.co.nz because it doesn't work with squid
run_iptables -t nat -A PREROUTING -i eth1 -p tcp -m tcp --dport 80 -d geekzone.co.nz -j ACCEPT
#Redirect all net traffic on eth1 to dansgaurdian on port 8080
run_iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 80 -j REDIRECT --to-port 8080
#Allow squid to bypass dansgaurdian
run_iptables -t nat -A OUTPUT -p tcp --dport 80 -m owner --uid-owner squid -j ACCEPT
run_iptables -t nat -A OUTPUT -p tcp --dport 3128 -m owner --uid-owner squid -j ACCEPT

iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE

Any advice on this issue would be greatly appreciated.