For me the solution is described here: http://acksyn.org/diary/?p=227&cpage=2#comment-2805 Set "REFERRALS off" in /etc/ldap/ldap.conf. Also, I didn't get an error in my error.log - it was only when I set "LogLevel debug" that I saw this: auth_ldap authenticate: user xyz authentication failed; URI /ldaptest/ [ldap_search_ext_s() for user failed][Operations error] Regards, Oskar Liljeblad (oskar@osk.mine.nu)