Data Federator connection error

Hi experts,
I am trying to connect Data Federator 3.0 SP2 to Netweaver BI 7.1 SP3 and getting the following error..
" The connection Data Federator Query Server Failed.. An Exception occured when querying Data Federator Query Server ...
com.sap.conn.jco.JCoException: (109) RFC_ERROR_CANCELLED. Handle close pending..."
Scenario:
I have created a new project in Data Federator and trying to Add a DataSource to it. When I fill in required details and click " Test Connection" button, the above mentioned error comes up.
I am pretty sure, I have connected to BI system before using the same username,password, client, hostname etc... before. However I am getting the error when I try now.
By the way, I have registered the callbackServerprogramID on DataFederator as well as BI as per user guide.
Could any one please share any ideas/ solutions
Thanks a lot
Phani.

More detail on the error from leselect.log (if it helps in any way......)___
2010/02/19 03:09:54.300|<=|||0|19222105| |||||||||||||||"[LeSelect.Api.LSStatementImpl] - [Execution Thread 9]Executing query: CALL getTables '/TEST/sysadmin/sources/draft', 'D_ZFCOM301', '%', CAST(null as VARCHAR)"
2010/02/19 03:09:54.315|==|W||0|19222105| |||||||||||||||"[LeSelect.Wrappers.SapNWBI.A.J] - [Execution Thread 9]Ignore destination registration request because this destination is already registred: sapauddb04-BO_service-12562982cf3123318931bc31ed325d329532fd33513388-en-0"
2010/02/19 03:09:54.409|>=|E||0|19222105| |||||||||||||||"[LeSelect.Core.n] - [Execution Thread 9]Wrapper Error:
LeSelect.Wrappers.SapNWBI.C: Connection failure: com.sap.conn.jco.JCoException: (109) RFC_ERROR_CANCELLED: Handle close pending
     at LeSelect.Wrappers.SapNWBI.H.B(y:194)
     at LeSelect.Wrappers.SapNWBI.X.getConnection(y:338)
     at LeSelect.Core.B.D.<init>(y:119)
     at LeSelect.Core.B.F.A(y:165)
     at LeSelect.Core.I.T.B(y:448)
     at LeSelect.Core.I.V.next(y:226)
     at LeSelect.B.C.G.A(y:367)
     at LeSelect.B.E.K.B(y:177)
     at LeSelect.B.E.G$_A.run(y:691)
Caused by: com.sap.conn.jco.JCoException: (109) RFC_ERROR_CANCELLED: Handle close pending
     at com.sap.conn.jco.rt.MiddlewareJavaRfc.generateJCoException(MiddlewareJavaRfc.java:604)
     at com.sap.conn.jco.rt.MiddlewareJavaRfc$JavaRfcClient.connect(MiddlewareJavaRfc.java:1270)
     at com.sap.conn.jco.rt.ClientConnection.connect(ClientConnection.java:661)
     at com.sap.conn.jco.rt.PoolingFactory.init(PoolingFactory.java:103)
     at com.sap.conn.jco.rt.ConnectionManager.createFactory(ConnectionManager.java:171)
     at com.sap.conn.jco.rt.DefaultConnectionManager.createFactory(DefaultConnectionManager.java:44)
     at com.sap.conn.jco.rt.ConnectionManager.getFactory(ConnectionManager.java:160)
     at com.sap.conn.jco.rt.RfcDestination.initialize(RfcDestination.java:766)
     at com.sap.conn.jco.rt.RfcDestination.ping(RfcDestination.java:976)
     at LeSelect.Wrappers.SapNWBI.X.getConnection(y:336)
     ... 7 more
Caused by:
RfcException: [System <empty>|sapauddb04/00]
    message: Handle close pending
    Return code: RFC_CLOSED(6)
    error group: 109
    key: RFC_ERROR_CANCELLED
     at com.sap.conn.rfc.engine.RfcIoOpenCntl.RfcIsValidHandle(RfcIoOpenCntl.java:2044)
     at com.sap.conn.rfc.engine.RfcIoOpenCntl.RfcReceive(RfcIoOpenCntl.java:1880)
     at com.sap.conn.rfc.api.RfcApi.RfcOpen(RfcApi.java:180)
     at com.sap.conn.jco.rt.MiddlewareJavaRfc$JavaRfcClient.connect(MiddlewareJavaRfc.java:1263)
Edited by: Phani Kothwali on Feb 19, 2010 4:49 AM

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