PIAPPLUSER RFC Connection SAP ABAP System to PI

Hi all,

Can someone please guide me, I've created an RFC connection in ABAP backend system to connect to PI system and when i do connection test it bring a pop to enter username and password.

In PI user PIAPPLUSER has roles SAP_BC_WEBSERVICE_PI_CFG_SRV and SAP_XI_APPL_SERV_USER. Also password in SM59 rfc is same in both PI's AS ABAP and exchangeProfile url. Please note the problem is in our QA ystem, in development it's working and i can do SPROXY without any problems.

I tried with both XI and xi in path prefix : /sap/XI/engine/?type=entry

Thank you and regards,

Katlego