SAP RFC Remote Connection

Hi,

I am having Problem in My RFC Connection .

I) created RFC in ECC to SAP BW  DW1CLNT600

II) Created RFC in SAP BW to ECC QA1CLNT210

I can do Remote Logon from ECC to BW But BW to ECC not Possible.

I did Remote Login from ECC to BW and from same login we can Remote login to ECC

SO I need a solution for RFC Remote Login from BW to ECC

Regards

Sunil Roy