1. Verify if the correct SQL port (indexserver port) has been provided in Applications Manager.
2. Verify the JDBC connection to SAP HANA DB via HANA Client Studio/DB Manager. Also verify the instance name.
3. The SQL port for the tenant database can be found in Hana Studio > administration console for the tenant database > Landscape > port #
under the SQL Port
column. For reference, check the screenshot below:
4. If JDBC connection is unsuccessful with correct the DB name, refer SAP note 2800117.