<font size=2 face="sans-serif">I'm seeing this problem running IKEv2 on
strongswan since installing 4.5.1. </font>
<br>
<br><font size=2 face="sans-serif">If strongswan initiates to a system
that does not return the NAT-D notify payloads on ike_sa_init response,
i see the following error on the strongswan console:</font>
<br><font size=2 face="sans-serif">If i run the same strongswan with basically
the same configuration to another system that does return the NAT-D notify
payloads i get no errors. </font>
<br><font size=2 face="sans-serif">the ipsec.conf is set to 'authby=secret'
in both cases.</font>
<br>
<br>
<br><font size=2 face="Courier New">initiating IKE_SA strongswan-system[1]
to 9.5.149.32</font>
<br><font size=2 face="Courier New">generating IKE_SA_INIT request 0 [
SA KE No N(NATD_S_IP) N(NATD_D_IP) ]</font>
<br><font size=2 face="Courier New">sending packet: from 9.5.149.53[500]
to 9.5.149.32[500]</font>
<br><font size=2 face="Courier New">received packet: from 9.5.149.32[500]
to 9.5.149.53[500]</font>
<br><font size=2 color=blue face="Courier New">payload of type CERTIFICATE_REQUEST
not occured 1 times (0)</font>
<br><font size=2 face="Courier New">IKE_SA_INIT response with message ID
0 processing failed</font>
<br><font size=2 face="Courier New">retransmit 1 of request with message
ID 0</font>
<br><font size=2 face="Courier New">sending packet: from 9.5.149.53[500]
to 9.5.149.32[500]</font>
<br><font size=2 face="Courier New">received packet: from 9.5.149.32[500]
to 9.5.149.53[500]</font>
<br><font size=2 face="Courier New">payload of type CERTIFICATE_REQUEST
not occured 1 times (0)</font>
<br><font size=2 face="Courier New">IKE_SA_INIT response with message ID
0 processing failed</font>
<br><font size=2 face="Courier New">retransmit 2 of request with message
ID 0</font>
<br><font size=2 face="Courier New">sending packet: from 9.5.149.53[500]
to 9.5.149.32[500]</font>
<br><font size=2 face="Courier New">received packet: from 9.5.149.32[500]
to 9.5.149.53[500]</font>
<br><font size=2 face="Courier New">payload of type CERTIFICATE_REQUEST
not occured 1 times (0)</font>
<br><font size=2 face="Courier New">IKE_SA_INIT response with message ID
0 processing failed</font>
<br><font size=2 face="sans-serif"><br>
<br>
</font>