URL for Fiori Launchpad designer does not work

Hello Experts,

I am trying to create Fiori catalog and trying to access the URL below. But it does not able to access the resource files such as abap.js, sap-ui-core.js and I get 403 error on my page.

http://<hostname:port>/sap/bc/ui5_ui5/sap/arsrvc_upb_admn/main.html?sap-client=025&sap-language=EN

Please find the attachment for the error message.

Could you please guide me.

Thank you,

Murali Pinnamaneni