Hello,
>>could you please let me know the if we have to do any configurations step up in NWA for server proxy.
There are two options, either you create a HTTP destination pointing to SAP R3 in NWA and refer that destination in SOAP (XI3.0) receiver channel (in that case u have to use Addressing Type as "HTTP Destination" in channel ) OR directly put the above mentioned URL in SOAP (XI 3.0) receiver channel.
>>SPROXY connectivity should be done at Inbound ECC and of type G?
Yes, but plz make sure that sldcheck is also working. Michal's blog has already been provided to u so plz refer that.
I would suggest you to start creating ur scenario and apprise us in case of any difficulties...
Thanks
Amit Srivastava