When DTS is run in scheduled time it fails with following error at step 3 after fetching certain records from Oracle giving below error, After failure when manually run from same client it executes successfully.
Executed as user: \sqlclust. Microsoft (R) SQL Server Execute Package Utility Version 10.50.1600.1 for 32-bit Copyright (C) Microsoft Corporation 2010. All rights reserved. Started: 12:35:19 AM Error: 2013-10-23 01:03:13.75 Code: 0xC0202009 Source: DFT_ PKG_CALL_WRAP_FS OLE_SRC_Call_Wrap_FS  Description: SSIS Error Code DTS_E_OLEDBERROR. An OLE DB error has occurred. Error code: 0x80004005. An OLE DB record is available. Source: "Microsoft OLE DB Provider for Oracle" Hresult: 0x80004005 Description: "ORA-12571: TNS:packet writer failure ". End Error Error: 2013-10-23 01:03:13.75 Code: 0xC0047038 Source: DFT_ TEST_CALL_WRAP_FS SSIS.Pipeline Description: SSIS Error Code DTS_E_MAINOUTPUTFAILED. The MainOutput method on component "OLE_SRC_Call_Wrap_FS" (1293) returned error code 0xC0202009. The component returned a failure code when the pipeline engine called PrimeOutput(). The meaning of the failure code is defined by the component, but the error is fatal and the pipeline stopped executing. There may be error messages posted before this with more information about the failure. End Error DTExec: The package execution returned DTSER_FAILURE (1). Started: 12:35:19 AM Finished: 1:04:30 AM Elapsed: 1751.7 seconds. The package execution failed. The step failed.