NWBC into Lauchpad - backend system

Hi,

few weeks ago I've been solving problem, how to integrate some SAP GUI t-codes into Fiori lauchpad (more here: Launchpad into nwbc ), on our testing system (NW 7.4 EHP7 Business suite) I was able to add tile to Fiori lauchpad for any SAPGUI t-code. But now I have troubles if I want to do the same for standalone Gateway system (where is the Fiori lauchpad) and the backend Business suite system (NW 7.00 ERP EHP 3). There is a configuration in LPD_CUST t-code on gateway system, where I can specify system alias, so I created in SM59 HTTP connection to ABAP system (to backend business suite system - thru web dispatcher) like this:

but then I can see in chrome console this:

http://backend_business_suite_url:8000/sap/bc/ui2/nwbc/~canvas;window=app/transaction/APB_LPD_CALL_TRANS?P_APPL=TRANSACTIONAL&P_OBJECT=&P_PNP=&P_ROLE=ZLPD&P_SELSCR=X&P_TCODE=CAT2&DYNP_OKCODE=onli&sap-client=900&sap-language=EN

with timeout error.....

Any solution for this?

Many thanks Jiri