I am using this tag for my user authentication proxy server. and its not working.i have done:
1.htpaaswd /etc/paasswd/passwd user
2.chmod o+r /etc/paasswd/passwd

3.configuration in squid.cong
auth_param basic program /usr/lib/squid/ncsa_auth /etc/squid/passwd
auth_param basic children 5
auth_param basic realm LA Proxy Server
auth_param basic credentialsttl 4 hours
auth_param basic casesensitive off
acl students proxy_auth REQUIRED
http_access allow students
4.restart service
but when i configure firefox to use this proxy,no authentication window opens and i cannot open a single website.

pls solve my problem.......it's urgent

auth_param basic program /usr/lib/squid/ncsa_auth /etc/squid/students
auth_param basic children 500
auth_param basic realm LA Proxy Server
auth_param basic credentialsttl 4 hours
auth_param blankpassword off
acl students proxy_auth REQUIRED
http_access allow students