Please perform it following: Step 1. Add a new LDAP Server under the External Auth Server. Step 2. Enter the details such as Server Name, IP Address of the external authentication server, the admin account username and password and select the BaseDN. After entered all the details, click the Test Validity to check whether able to connect the external authentication server or not. Step 3. After tested the validity, a message will prompt out to show the result. Step 4. Click the Sync with all LDAP servers to sync all the data. Now, the configuration is successfully set.