HTTP destination at NWA-Configuration-Infrastructure-Destinations

Hello Experts ,

We are having PO 7.4 single stack . We were asked to make connectivity of ECC with PO . So we have made connectivity properly and have checked in sxmb_Adm , sldcheck and sproxy t codes in ECC and everything working fine . Going ahead client has asked us to maintain HTTP destination in PO at  NWA-Configuration-Infrastructure-Destinations path pointing to ECC .

So we tried to create HTTP connection on PO pointing towards ECC but getting error while pinging the destination as ''Error during ping operation , received HTTP response 500''. Kindly help

Also why we need to create this connection in PO ? Is it really required ? because i have searched on SCN and found that it is not required .

Please Explain .

Regards ,

Mrudula Rane