Problem IN JCO between BW and BO

Hi all,

     I have an installation in which BW and BO are in the same machine. But when I create a JCO connection through Information design tool, it works fine for 2 or three refreshers and then it throws the following error: "An error occurred while trying to ping the server: The SAP BW server reported an RFC error: Erreur lors du rappel RFC : Failed to refresh repository reference @DF_DEST-17 2.16.1.3-BIUSER-0--0-100 cause"

And when I try the ping the machine it works fine. Can someone help me with that?

Here is my server configuration:

SAP BO : Business Objects Plateform BI 4.1 SP05 Patch9

SAP BW: 740 SP09

OS: Linux Suse

Best Regards,