Hi Amos Squid Version is 3.3.9 im using basic authentication. I don't know exactly what you mean with wheres the username come from. I think it comes from the auth helper and it's passed to the external acl helper via the %LOGIN variable. bazn -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/external-acl-type-strange-behavior-tp4664718p4664734.html Sent from the Squid - Users mailing list archive at Nabble.com.