Hi @DamasMakweba_cd63 - if your ldap is working, and the idp service is giving ldap connection errors, then there must be a problem with the configuration of the resolver and/or login.properties.
Without a view into your configuration, we can't provide any further suggestion
The best I can do is provide you with what the configuration should be. The templates for the configuraiton are :
Maybe that can help you find the bug.
I remember a while back that there was some mismatch between the configurations at your site, where a different war was being used, or a different config. I don't have the full information for you, since again that wasn't in a repo anywhere. Have a look and let us know if that helps - but most importantly - get your configuration into change control