Invalid LDAP Server

Guys I have a slight issue adding an LDAP Server, or more explicitly connected the added LDAP Server in the Security Fabric>Connector. I have added the LDAP Server, verified the credentials and tested connectivity. The Server is listening on 389 but when I add the fabric connector I keep getting the invalid message and a referral error.   Below is a screen grab showing the LDAP Server was added and tested but then the error appears when adding it to the Security Fabric.