diff --git a/src/libcharon/bus/bus.h b/src/libcharon/bus/bus.h
index aba8acdbd..4bde2434b 100644
--- a/src/libcharon/bus/bus.h
+++ b/src/libcharon/bus/bus.h
@@ -90,6 +90,8 @@ enum alert_t {
 	ALERT_PEER_AUTH_FAILED,
 	/** failed to resolve peer address, no arguments */
 	ALERT_PEER_ADDR_FAILED,
+	/** peer did not respond to initial message, current try (int, 0-based) */
+	ALERT_PEER_INIT_UNREACHABLE,
 };
 
 /**
diff --git a/src/libcharon/sa/ike_sa.c b/src/libcharon/sa/ike_sa.c
index 1d49acb52..d9118fc49 100644
--- a/src/libcharon/sa/ike_sa.c
+++ b/src/libcharon/sa/ike_sa.c
@@ -1690,6 +1690,8 @@ METHOD(ike_sa_t, retransmit, status_t,
 			{
 				/* retry IKE_SA_INIT/Main Mode if we have multiple keyingtries */
 				u_int32_t tries = this->peer_cfg->get_keyingtries(this->peer_cfg);
+				charon->bus->alert(charon->bus, ALERT_PEER_INIT_UNREACHABLE,
+								   this->keyingtry);
 				this->keyingtry++;
 				if (tries == 0 || tries > this->keyingtry)
 				{