[squid-users] squid not asking for authentication

i am trying to set up a squid but its not asking for authentication.. were am
i going wrong i not able to find out
this is what i am doing

i am using UBUNTU

NIC that i am using is having ip 192.168.7.253

static ip-192.168.7.253
netmask-255.255.255.0
gateway address-192.168.7.254

give my pc a name in host file
192.168.7.253 = testmachine
 
then install squid
2}apt-get install squid-common
3}apt-get install apache2-utils

4)then chown proxy:proxy /etc/squid/squid.conf
5)now create user htpasswd -c /etc/squid/passwd garima
passwrd -garima
6} chmod o+r /etc/squid/passwd
7)then i do the setting squid.conf

1}auth_param basic program /usr/lib/squid/ncsa_users /etc/squid/passwd
auth_param basic children 5
auth_param basic realm SQUID s there
auth_param basic credtinal 2 hours
auth_param basic cassesitive 0ff
now acl list
2}acl ncsa_users proxy_auth REQUIRED
acl internal_network src 192.168.7.253
acl password proxy_auth REQUIRED
now http turn
3}http_access allow internal_network
http_access allow ncsa_users
http_access allow password
now save nd close this
8}now http_port 3128
9}now we have to rout the traffic
iptables -L
it will show firewalls are disable
10}vi /etc/iptables.rules
now add
iptables -t nat -A PREROUTING -i eth0 -p tcp ---dport 80 -j REDIRECT
--to-port 3128
save and close this
11)now do iptables-save > /etc/iptables.rules
12) now to vi /etc/network/interfaces
13)now /etc/init.d/squid restart
14)now /etc/init.d/networking restart

its still not working ... not asking for password

were am i going wrong

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