LDAP Authentication Failure

hi so it is an emergency  and odd one .here is my problem : all computers witch can logon to all computers under this setting: "active directory account Tab on log on to" can authenticate with ldap server and nothing's wrong.but all those computer which just can log on to their computer during the last setting( "on active directory account Tab on log on to") authentication failure message just show up. and here is the  LDAP Setting on Fortigate:

config user ldap edit "LDAP-sanjeshdc1" set server "192.168.*.*" set cnid "sAMAccountName" set dn "dc=******,dc=net" set type regular set username "user with privilege " set password:...