Secure VPN Connection terminated by Peer(Reason not specified by Peer) Reason:433

I have a client connecting to my VPN infra, for some reason they connect and for about 16 seconds get disconnected and receive an error "Secure VPN Connection Terminated by Peer: Reason:433". I have searched on the net but couldn't find a helpful solution.

My thinking is that is something to do with VPN Client and the client OS because I simulated the connection on my laptop I did not receive an error and I have other clients using the same VPN but don't get the error.

This is the sample of the error log:

124 06:55:22.419 06/24/16 Sev=Info/4 IKE/0x63000013 SENDING >>> ISAKMP OAK INFO *(HASH, NOTIFY:DPD_REQUEST) to ***.***.***.***

125 06:55:22.429 06/24/16 Sev=Info/4 IKE/0x63000014 RECEIVING

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