Login AD Java 8

Question

I am trying to log on to the ad, but soon on the Admim user already error 502e. But user and password are correct, which may be wrong here

 @PostMapping("loginJndi")
public logonModel authenticateJndi(@RequestBody logonModel modelAuth) throws Exception{
    logonModel model = new logonModel();
    try {


    Properties props = new Properties();
    props.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
    props.put(Context.PROVIDER_URL, "ldap://10.xx.254.5:xxx");
    props.put(Context.SECURITY_PRINCIPAL, "[email protected],dc=br,dc=empresa,dc=com");//adminuser - User with special priviledge, dn user
    props.put(Context.SECURITY_CREDENTIALS, "Y,I,5g5l");//dn user password
    InitialDirContext context = new InitialDirContext(props);

    SearchControls ctrls = new SearchControls();
    ctrls.setReturningAttributes(new String[] { "givenName", "sn","memberOf" });
    ctrls.setSearchScope(SearchControls.SUBTREE_SCOPE);

    NamingEnumeration<javax.naming.directory.SearchResult> answers = context.search("[email protected]", "(uid=" + modelAuth.username + ")", ctrls);
    javax.naming.directory.SearchResult result = answers.nextElement();

    String user = result.getNameInNamespace();

    try {
        props = new Properties();
        props.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
        props.put(Context.PROVIDER_URL, "ldap://10.xx.254.5:xxx");
        props.put(Context.SECURITY_PRINCIPAL, user);
        props.put(Context.SECURITY_CREDENTIALS, modelAuth.password);
        context = new InitialDirContext(props);
        model.status = true;
        model.mensagem = context.toString();

    } catch (Exception e) {
       model.status = false;
       model.mensagem = e.getMessage();
    }
    }catch (Exception e)
    {
      model.mensagem = e.getMessage();
    }
    return  model;
}