$ldap_host = "127.0.1.1";
the ldap host should be that of you domain controller, not the mrbs server.
my working config:
Code:
$auth["type"] = "ldap";
//# 'auth_ldap' configuration settings
//# Where is the LDAP server
$ldap_host = "192.168.0.5";
//# If you have a non-standard LDAP port, you can define it here
$ldap_port = 389;
//# If you want to use LDAP v3, change the following to true
$ldap_v3 = true;
//# If you want to use TLS, change following to true
$ldap_tls = false;
//# LDAP base distinguish name
//# See AUTHENTICATION for details of how check against multiple base dn's
$ldap_base_dn = "ou=staff,dc=example,dc=college,dc=internal";
$ldap_user_attrib = "uid";
// If you need to search the directory to find the user's DN to bind
// with, set the following to the attribute that holds the user's
// "username". In Microsoft AD directories this is "sAMAccountName"
$ldap_dn_search_attrib = "sAMAccountName";
$ldap_dn_search_dn = "cn=LDAP,cn=Users,dc=example,dc=college,dc=internal";
$ldap_dn_search_password = "xxxx";