[ibr-dtn] Ibr-dtn Warning message

Hello, I downloaded ibr-dtn implementation for Ubuntu 14.04 and installed it on two PCs with similar configuration. I am running dtnsend on one pc and dtnrecv on another. The bundles are accepted and the file reaches the dtnrecv.

Later I run the dtnsend on the PC which was running dtnrecv and dtnrecv on the PC which was running dtnsend, I am getting Warning "*bundle rejected due to invalid authentication*" on the PC that is running dtnrecv. Can u plz help me what could be the problem or should I do any other change for the dtnrecv to accept packets.

Thanks in advance