[ibr-dtn] bundle rejected due to invalid authentication

Hi dears, =>when I ping from pc1 to pc2 , the output is :*Timeout* from pc1 and : *Bundle rejected due to invalid authentication* from pc2 =>When I ping from pc2 to pc1 the out put is : *Timeout* from pc2 and *Bundle rejected :bundle has expired* from pc1

I paused ping and then make an other ping , it generates different key(session key ) in both cases.

I think it is authentication issue (if I am right).How can I troubleshoot this ?

Thanks in advance.

*Tadewos Somano*