IPROHC certificate cannot be verified

Hi,
I am testing IP ROHC on cent OS boxes. Installed software version is iprohc-main. Installed server and client on two different cent os boxes(centos 7.1). Created certificates for client and server as per below URL.

http://rohc-lib.org/wiki/doku.php?id=iprohc-run

Started the server successfully, When IP ROHC client is connected with Server using below command
iprohc_client --remote x.x.x.x --port 3126 --dev iprohc -b eth0 --p12 /etc/pki/CA/certs/IpRohcClient1/client1.p12, server is throwing below errors as below.

Oct 14 11:26:22 kkmubuntu iprohc_server[3465]: [main] new connection from client
Oct 14 11:26:22 kkmubuntu iprohc_server[3465]: [main] will store client 1/50 at index 0
Oct 14 11:26:22 kkmubuntu iprohc_server[3465]: [104.131.12.124] new connection from 104.131.12.124:51237
Oct 14 11:26:22 kkmubuntu iprohc_server[3465]: start of thread
Oct 14 11:26:22 kkmubuntu iprohc_server[3465]: TLS handshake succeeded
Oct 14 11:26:22 kkmubuntu iprohc_server[3465]: certificate cannot be verified (status 66)
Oct 14 11:26:22 kkmubuntu iprohc_server[3465]: - unable to trust certificate issuer
Oct 14 11:26:22 kkmubuntu iprohc_server[3465]: close TLS session
Oct 14 11:26:22 kkmubuntu iprohc_server[3465]: end of thread

Please suggest me.

Thanks,
Kimo

Answered on mailing list. Closed because it is a duplication.