diff --git a/doc/Changelog b/doc/Changelog
index 0d110b214..edb574cb2 100644
--- a/doc/Changelog
+++ b/doc/Changelog
@@ -1,3 +1,8 @@
+11 April 2019: Wouter
+	- Fix that auth zone uses correct network type for sockets for
+	  SOA serial probes.  This fixes that probes fail because earlier
+	  probe addresses are unreachable.
+
 8 April 2019: Wouter
 	- Fix to use event_assign with libevent for thread-safety.
 	- verbose information about auth zone lookup process, also lookup
diff --git a/services/authzone.c b/services/authzone.c
index e16a39649..c3691bd6c 100644
--- a/services/authzone.c
+++ b/services/authzone.c
@@ -5900,7 +5900,18 @@ xfr_probe_send_probe(struct auth_xfer* xfr, struct module_env* env,
 		xfr->task_probe->id = (uint16_t)(ub_random(env->rnd)&0xffff);
 	xfr_create_soa_probe_packet(xfr, env->scratch_buffer, 
 		xfr->task_probe->id);
+	/* we need to remove the cp if we have a different ip4/ip6 type now */
+	if(xfr->task_probe->cp &&
+		((xfr->task_probe->cp_is_ip6 && !addr_is_ip6(&addr, addrlen)) ||
+		(!xfr->task_probe->cp_is_ip6 && addr_is_ip6(&addr, addrlen)))
+		) {
+		comm_point_delete(xfr->task_probe->cp);
+		xfr->task_probe->cp = NULL;
+	}
 	if(!xfr->task_probe->cp) {
+		if(addr_is_ip6(&addr, addrlen))
+			xfr->task_probe->cp_is_ip6 = 1;
+		else 	xfr->task_probe->cp_is_ip6 = 0;
 		xfr->task_probe->cp = outnet_comm_point_for_udp(env->outnet,
 			auth_xfer_probe_udp_callback, xfr, &addr, addrlen);
 		if(!xfr->task_probe->cp) {
diff --git a/services/authzone.h b/services/authzone.h
index 4706803a8..376fe5144 100644
--- a/services/authzone.h
+++ b/services/authzone.h
@@ -327,6 +327,8 @@ struct auth_probe {
 	/** the SOA probe udp event.
 	 * on the workers event base. */
 	struct comm_point* cp;
+	/** is the cp for ip6 or ip4 */
+	int cp_is_ip6;
 	/** timeout for packets.
 	 * on the workers event base. */
 	struct comm_timer* timer;