Please ensure that your LDAP config should look like this, th error you're seeing mainly due to naming-attribute or
incorrect login-dn format
aaa-server LDAP-AD protocol ldap
aaa-server LDAP-AD host
server-port 389
ldap-base-dn
ldap-scope subtree
ldap-naming-attribute sAMAccountName
ldap-login-dn
ldap-login-password
server-type microsoft
Login user DN= username@domain-name
If the above suggestion doesn't work then first install and run the softerra browser and see if this admin accounts work for that.
http://www.ldapadministrator.com/download.htm
LDAP Browser 2.6
Rgds, Jatin
Do rate helpful posts~
~Jatin