Hi Amos, thanks for your clarification and the link. So i try now the following: 1) Add a working basic auth to auth_param (probably ldap_auth). 2) Modify the access list from http_access allow ldapgroup-access http_access deny all to http_access deny !ldapgroup-access http_access allow all This should trigger then the mentioned authentication loop mentioned in the FAQ and hope that at least the used browsers work sane... I dont care about update agents (adobe, java, ...), they should be disabled in this environment anyway. Robert Am Donnerstag, den 07.07.2011, 00:39 +1200 schrieb Amos Jeffries: > > That will probably die horribly. NTLM & Negotiate both hijack HTTP to > try and authenticate the TCP-level. Once credentials are accepted a > change in auth requires the TCP link itself to be terminated. > > You can cause a re-auth challenge, but Squid will still offer the same > set of Negotaiate,NTLM,Basic as available. The sane browsers should move > on to the next available choice they have not tried (most agents are not > that sane though). > > Details of how to re-auth are in the FAQ: > > http://wiki.squid-cache.org/Features/Authentication#How_do_I_ask_for_authentication_of_an_already_authenticated_user.3F > > Amos -- Robert Velter <Robert@xxxxxxxxx>