Hi Ankit,
We saw this same issue.
'rfc connection closed(no data) '
However, ours seen in SM58 after trying to send the IDoc to Data Serivces.
It was solved by setting the SAP RFC Dest for the Data Services to Unicode.
We are on DS 4.2 SP1 P2
Here is the sap notes
1584583 - IDOC causes Data Services Access Server to recycle
Cause: In Data Services 4.0, Access Server only works when the connection is set to be in Unicode.
Resolution: Set RFC Connection to send Unicode data.
1676649 - Codepage issues when sending IDoc from SAP system to Data Services
Resolution: b) If you are using Data Services 4.0 your RFC Destination should be set to Unicode.
Since this is an old post you may alrady have a solution.
Did you figure out how to create a test idoc file that you could use when you run the real time job from the DS Designer?
Jay Roble