[SQU] Bypass squid authentication

Can anyone help me with the following:

I have a squid configuration file with allows 'vips' to bypass the user
authentication. To make this work I placed the acl for vips on top and made
the http_access for vips the first one in the list. However it still asks
the specific host for a username and password.. What am I doing wrong?!

Conf. file:

http_port 80

cache_mem 10 mb
cache_effective_user squid
cache_effective_group nogroup

authenticate_program /var/spool/squid/smb_auth -W MARK

acl all src 0.0.0.0/0.0.0.0

acl vips src 128.1.2.240
acl manager proto cache_object
acl localhost src 127.0.0.1/255.255.255.255
acl users proxy_auth REQUIRED
acl SSL_ports port 443 563
acl Safe_ports port 81 80 21 443 563 70 210 1025-65535
acl CONNECT method CONNECT

acl argo dstdomain .mark.nl
always_direct allow mark

http_access allow vips
http_access allow users
http_access allow manager localhost
http_access deny manager
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access deny all
#http_access allow all
icp_access allow all
miss_access allow all

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