[squid-users] Squid 3.4.8 helpers doesn't work how I want !

[Hack Ensolo]

Hi,
I try to authenticate a user in AD (windows server 2008 R2).
When he is in a group Webusers he must authenticated and when I remove the
user of this group, he must not authenticated.
And this process doesn't work because he is always authticated.

Sorry for my english.

I post the squid configuration...
I don't post the logs because I 'm not errors.

cache_mgr service.informatique@ <service.informatique at ipl.be>example.com

### Negotiate kerberos authentification
auth_param negotiate program /usr/lib/squid3/negotiate_kerberos_auth -s
HTTP/rex.example.com at EXAMPLE.COM
auth_param negotiate children 20 startup=0 idle=1
auth_param negotiate keep_alive off

### ldap authorisation
external_acl_type kerbgroup ttl=60 children-max=15 children-startup=10 ipv4
%LOGIN /usr/lib/squid3/ext_ldap_group_acl -R -K -b
ou=students,dc=server,dc=example,dc=com -D squid at example.com -W
/etc/squid3/ldappass.txt -f
"(&(objectclass=person)(sAMAccountName=%v)(memberof=cn=%g,ou=students,dc=server,dc=example,dc=com))"
-h dc1.server.example.com

### acl for proxy auth and ldap authorizations
acl auth proxy_auth REQUIRED
acl kerbusers external kerbgroup webusers

### squid defaults
acl localnet src 172.17.0.0/16
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 CONNECT method CONNECT
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access allow localhost

### http_access rules
http_access allow manager localhost
http_access allow auth
http_access deny !auth
http_access allow kerbusers
http_access allow localnet
http_access deny manager
http_access deny all

### logging
access_log stdio:/var/log/squid3/access.log
cache_store_log stdio:/var/log/squid3/store.log

### squid Debian defaults
http_port 3128
cache_effective_user proxy
cache_effective_group proxy
cache_dir ufs /cache1 20000 16 256
cache_dir ufs /cache2 20000 16 256
coredump_dir /var/spool/squid3

### default squid rules
refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern -i (/cgi-bin/|\?) 0     0%      0
refresh_pattern .               0       20%     4320
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