[strongSwan] Couldn't establish IKEv2 vpn connection using strongswan, log shows timeout

[Joshua Nocturne]

Hello,
    I got some problems about the configuration of strongswan, no matter
how I configured the IKEv2 connection just couldn't establish. The
strongswan's log is like this:
Nov  7 18:52:21 05[NET] <1> received packet: from 183.131.17.162[380] to
47.90.13.129[500] (616 bytes)
Nov  7 18:52:21 05[ENC] <1> parsed IKE_SA_INIT request 0 [ SA KE No
N(NATD_S_IP) N(NATD_D_IP) V V V V ]
Nov  7 18:52:21 05[IKE] <1> received MS NT5 ISAKMPOAKLEY v9 vendor ID
Nov  7 18:52:21 05[IKE] <1> received MS-Negotiation Discovery Capable
vendor ID
Nov  7 18:52:21 05[IKE] <1> received Vid-Initial-Contact vendor ID
Nov  7 18:52:21 05[ENC] <1> received unknown vendor ID:
01:52:8b:bb:c0:06:96:12:18:49:ab:9a:1c:5b:2a:51:00:00:00:02
Nov  7 18:52:21 05[IKE] <1> 183.131.17.162 is initiating an IKE_SA
Nov  7 18:52:21 05[IKE] <1> remote host is behind NAT
Nov  7 18:52:21 05[ENC] <1> generating IKE_SA_INIT response 0 [ SA KE No
N(NATD_S_IP) N(NATD_D_IP) N(MULT_AUTH) ]
Nov  7 18:52:21 05[NET] <1> sending packet: from 47.90.13.129[500] to
183.131.17.162[380] (312 bytes)
Nov  7 18:52:22 16[NET] <1> received packet: from 183.131.17.162[380] to
47.90.13.129[500] (616 bytes)
Nov  7 18:52:22 16[ENC] <1> parsed IKE_SA_INIT request 0 [ SA KE No
N(NATD_S_IP) N(NATD_D_IP) V V V V ]
Nov  7 18:52:22 16[IKE] <1> received retransmit of request with ID 0,
retransmitting response
Nov  7 18:52:22 16[NET] <1> sending packet: from 47.90.13.129[500] to
183.131.17.162[380] (312 bytes)
Nov  7 18:52:23 11[NET] <1> received packet: from 183.131.17.162[380] to
47.90.13.129[500] (616 bytes)
Nov  7 18:52:23 11[ENC] <1> parsed IKE_SA_INIT request 0 [ SA KE No
N(NATD_S_IP) N(NATD_D_IP) V V V V ]
Nov  7 18:52:23 11[IKE] <1> received retransmit of request with ID 0,
retransmitting response
Nov  7 18:52:23 11[NET] <1> sending packet: from 47.90.13.129[500] to
183.131.17.162[380] (312 bytes)
Nov  7 18:52:51 15[JOB] <1> deleting half open IKE_SA after timeout

   Need you help, please.
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