Ok so you have Windows Server 2003 R2. Do you have all updates installed on windows server? what shows netstat -aon in cmd? is there port 389 open? 3.3.10 should work... Did you build it by yourself? -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/Cannot-get-basic-ldap-auth-to-work-with-AD-tp4663282p4663407.html Sent from the Squid - Users mailing list archive at Nabble.com.