[squid-users] google picking up squid as

I get the following notice from google's site when connected to the proxy:
Our systems have detected unusual traffic from your computer network.

Any ideas how I can prevent this? I presume it might be the forwarded
for argument?
The following is my conf:

auth_param basic realm proxy server
auth_param basic credentialsttl 2 hours
auth_param basic program /usr/lib64/squid/ncsa_auth /etc/squid/squid_passwd
authenticate_cache_garbage_interval 1 hour
authenticate_ip_ttl 2 hours
acl manager proto cache_object
acl localhost src 127.0.0.1/32
acl to_localhost dst 127.0.0.0/8
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 1863 # MSN messenger
acl ncsa_users proxy_auth REQUIRED
acl CONNECT method CONNECT
http_access deny manager
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access deny to_localhost
http_access allow localhost
http_access allow ncsa_users
http_access deny all
icp_access allow all
http_port 8080
http_port 123.123.123.123:80
cache deny all
access_log /var/log/squid/access.log squid
cache_log /var/log/squid/cache.log
buffered_logs on
half_closed_clients off
visible_hostname ProxyServer
log_icp_queries off
dns_nameservers 208.67.222.222 208.67.220.220
hosts_file /etc/hosts
memory_pools off
client_db off
delay_pools 1
delay_class 1 2
delay_parameters 1 -1/-1 400000/400000
forwarded_for off
via off
Received on Sat Jun 07 2014 - 15:15:05 MDT