diff -Naur libreswan-3.25-orig/programs/pluto/ikev1.c libreswan-3.25/programs/pluto/ikev1.c

--- libreswan-3.25-orig/programs/pluto/ikev1.c	2018-06-27 22:42:26.000000000 +0700

+++ libreswan-3.25/programs/pluto/ikev1.c	2018-11-22 20:04:44.961824151 +0700

@@ -727,28 +727,7 @@

 			return dpd_inR(st, n, n_pbs);

 		case PAYLOAD_MALFORMED:

-			if (st != NULL) {

-				st->hidden_variables.st_malformed_received++;

-

-				libreswan_log(

-					"received %u malformed payload notifies",

-					st->hidden_variables.st_malformed_received);

-

-				if (st->hidden_variables.st_malformed_sent >

-				    MAXIMUM_MALFORMED_NOTIFY / 2 &&

-				    ((st->hidden_variables.st_malformed_sent +

-				      st->hidden_variables.

-				      st_malformed_received) >

-				     MAXIMUM_MALFORMED_NOTIFY)) {

-					libreswan_log(

-						"too many malformed payloads (we sent %u and received %u",

-						st->hidden_variables.st_malformed_sent,

-						st->hidden_variables.st_malformed_received);

-					delete_state(st);

-					md->st = st = NULL;

-				}

-			}

-

+			libreswan_log("received PAYLOAD_MALFORMED");

 			return STF_IGNORE;

 		case ISAKMP_N_CISCO_LOAD_BALANCE: