LDAP Connectio-Config

At first your code is correct.

Here's a MOC created when I developed this kind of integration.
Class HslBus.Msg.AdService.ValidaLogin.Response Extends %Persistent
{

Property LoginAtivo As %Boolean;

}

In Other Class I'm created this Method:

ClassMethod ValidarLogin(pRequest As HslBus.Msg.AdService.ValidaLogin.Request, Output pResponse As HslBus.Msg.AdService.ValidaLogin.Response) As %Status
{
set pResponse = ##class(HslBus.Msg.AdService.ValidaLogin.Response).%New()
set BaseDN="DC=Server,DC=pvt"
set Filter="(&(objectCategory=person)(objectClass=user) (sAMAccountname=" _ pRequest.Usuario.Login _ "))"

set Attributes=""
set ServerTimeout=5000

set LD=##Class(%SYS.LDAP).Init("hsl.pvt",389)


Set Status0=##Class(%SYS.LDAP).Binds(LD,"",$lb(pRequest.Usuario.Login,"Server.pvt",pRequest.Usuario.Senha),$$$LDAPAUTHNEGOTIATE)
set checkFilter=##class(%SYS.LDAP).CheckFilter(LD,Filter)

set Status=##Class(%SYS.LDAP).SearchExts(LD,BaseDN,$$$LDAPSCOPESUBTREE,Filter,"",0,"","",10,0,.SearchResult)

if (Status = $$$LDAPSUCCESS){
set pResponse.LoginAtivo = 1
}
else{
set pResponse.LoginAtivo = 0
}

quit $$$OK
}

To verify this type of support when I developed an LDAP integration I used the LDAP Admin available at http://www.ldapadmin.org/
If you also do not connect to AD, check with the infrastructure team if AD is enabled to receive LDAP connections.