Problem solved. I installed squid 2.6 and tested with the same config of 3.0. It worked directly. Hi Squid users, i have a question about the two helper program on squid. Both programs are working on the command line but if i want to authenticate the user over the proxy authentication nothing happens. During the sniffs using wireshark i get the information that the browser (tested with Firefox and Internet Explorer) authenticator send the credentials like "username:password", which is not that what the helper use. Is there any flag which changed the separator for this commands or an other workaround? Server OS: Ubuntu faisty Squid : version 3 AD Server: Windows 2003 Thanks in advance, Lauedoi