Tired above options already. Tunnel and traffic is stable for days that is not the issue But I have different requirement where connectivity between two vpn gw goes down for some time. I wrote one task scheduler which reset ipsec when connection is down. But when there is no connection between two vpn gw and I do reset vpn that command take too much time to exit and deny my script to run further. When I do reset vpn manually same thing happens. Already provided charon log in my post.