[squid-users] Squid Newbie needs help

Hi, I'm trying to setup a proxy server, I'm using redHat 7.1 , I believe
Squid version is 2.3-Stable4-10.

The machine it is the gateway, DNS, mailserver and router for the company.
It has two network cards, eth0 is conected to the internet, eth1 to the LAN.
I can see the machine from the LAN, and in the clients internet
configuration (Windows NT network) to use my server as proxy (195.69.0.245
port 3128). But, when I tried to connect, this is the error message I get:

ERROR
The requested URL could not be retrieved
----------------------------------------------------------------------------

----
While trying to retrieve the URL: http://my.yahoo.com/
The following error was encountered:
Access Denied.
Access control configuration prevents your request from being allowed at
this time. Please contact your service provider if you feel this is
incorrect.
Your cache administrator is root.
----------------------------------------------------------------------------
----
Generated Thu, 22 Nov 2001 07:09:30 GMT by ns1.setecsa.com
(Squid/2.3.STABLE4)
I made this changes in the squid.conf file:
ident_lookup on
acl all src 195.69.0.0/24
acl identifiquense src 195.69.0.0/255.255.255.0
acl nivel1 ident eperilla
acl nivel2 ident auribe
acl nivel3 ident rbayona acarrill uhernand
acl manager proto cache_object
acl localhost src 127.0.0.1/255.255.255.255
acl SSL_ports port 443 563
acl Safe_ports port 80 21 443 563 70 210 1025-65535
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 CONNECT method CONNECT
ident_lookup_access allow identifiquense
ident_lookup_access deny all
http_access allow manager localhost
http_access deny manager
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access allow localhost nivel1 nivel2 nivel3
http_access allow all
I restart squid service every time I change the squid.conf file.
But the error message remains. I know I might be making a fool mistake, but
I would love if somebody can help me?
I want squid to prompt for username and password.... How do I do that?
Thanks a lot,
Rafael