[strongSwan] AUTH FAIL but I cannot figure out the reason

[smokeyduck at orzlab.com]

Hi, I'm trying to let my android device(4.2.2) connect to openwrt with strongswan.
Android device use strongswan client for android 5.4.0 and openwrt use 5.3.3.

I use IKEv2 and RSA only.
Android device send IKE_AUTH request.
But, openwrt return IKE_AUTH response[N(AUTH_FAILED)] all of a sudden.

I see log. but I cannot figure out dubious point.
Is there someone have any hint for it?

Logs and details are too massive so stored in googledrive.
https://drive.google.com/file/d/0B_3Jb-3M8uFGeUFCVzF6SWpLUDA/view?usp=sharing

Regards,

Ariwa.