diff --git a/lib/isc/netmgr/udp.c b/lib/isc/netmgr/udp.c
index cd5513fc58..cda3d9d98c 100644
--- a/lib/isc/netmgr/udp.c
+++ b/lib/isc/netmgr/udp.c
@@ -846,10 +846,6 @@ isc_nm_udpconnect(isc_nm_t *mgr, isc_sockaddr_t *local, isc_sockaddr_t *peer,
 	RUNTIME_CHECK(result == ISC_R_SUCCESS ||
 		      result == ISC_R_NOTIMPLEMENTED);
 
-	result = isc__nm_socket_reuse_lb(sock->fd);
-	RUNTIME_CHECK(result == ISC_R_SUCCESS ||
-		      result == ISC_R_NOTIMPLEMENTED);
-
 	(void)isc__nm_socket_incoming_cpu(sock->fd);
 
 	(void)isc__nm_socket_disable_pmtud(sock->fd, sa_family);
diff --git a/tests/isc/netmgr_common.c b/tests/isc/netmgr_common.c
index e92a59bad5..62c9ed74eb 100644
--- a/tests/isc/netmgr_common.c
+++ b/tests/isc/netmgr_common.c
@@ -95,69 +95,20 @@ bool allow_send_back = false;
 bool noanswer = false;
 bool stream_use_TLS = false;
 bool stream = false;
+in_port_t stream_port = 0;
 
 isc_nm_recv_cb_t connect_readcb = NULL;
 
-int
-setup_ephemeral_port(isc_sockaddr_t *addr, sa_family_t family) {
-	socklen_t addrlen = sizeof(*addr);
-	uv_os_sock_t fd = -1;
-	int r;
-
-	isc_sockaddr_fromin6(addr, &in6addr_loopback, 0);
-
-	fd = socket(AF_INET6, family, 0);
-	if (fd < 0) {
-		perror("setup_ephemeral_port: socket()");
-		return (-1);
-	}
-
-	r = bind(fd, (const struct sockaddr *)&addr->type.sa,
-		 sizeof(addr->type.sin6));
-	if (r != 0) {
-		perror("setup_ephemeral_port: bind()");
-		isc__nm_closesocket(fd);
-		return (r);
-	}
-
-	r = getsockname(fd, (struct sockaddr *)&addr->type.sa, &addrlen);
-	if (r != 0) {
-		perror("setup_ephemeral_port: getsockname()");
-		isc__nm_closesocket(fd);
-		return (r);
-	}
-
-#if IPV6_RECVERR
-#define setsockopt_on(socket, level, name) \
-	setsockopt(socket, level, name, &(int){ 1 }, sizeof(int))
-
-	r = setsockopt_on(fd, IPPROTO_IPV6, IPV6_RECVERR);
-	if (r != 0) {
-		perror("setup_ephemeral_port");
-		isc__nm_closesocket(fd);
-		return (r);
-	}
-#endif
-
-	return (fd);
-}
-
 int
 setup_netmgr_test(void **state) {
 	char *env_workers = getenv("ISC_TASK_WORKERS");
-	uv_os_sock_t tcp_listen_sock = -1;
 	size_t nworkers;
 
 	tcp_connect_addr = (isc_sockaddr_t){ .length = 0 };
 	isc_sockaddr_fromin6(&tcp_connect_addr, &in6addr_loopback, 0);
 
 	tcp_listen_addr = (isc_sockaddr_t){ .length = 0 };
-	tcp_listen_sock = setup_ephemeral_port(&tcp_listen_addr, SOCK_STREAM);
-	if (tcp_listen_sock < 0) {
-		return (-1);
-	}
-	isc__nm_closesocket(tcp_listen_sock);
-	tcp_listen_sock = -1;
+	isc_sockaddr_fromin6(&tcp_listen_addr, &in6addr_loopback, stream_port);
 
 	if (env_workers != NULL) {
 		workers = atoi(env_workers);
diff --git a/tests/isc/netmgr_common.h b/tests/isc/netmgr_common.h
index 17eb27b041..31d63f3fc9 100644
--- a/tests/isc/netmgr_common.h
+++ b/tests/isc/netmgr_common.h
@@ -18,6 +18,16 @@
 
 #include "netmgr/netmgr-int.h"
 
+/*
+ * Pick unused port outside the ephemeral port range, so we don't clash with
+ * connected sockets.
+ */
+#define UDP_TEST_PORT	 9153
+#define TCP_TEST_PORT	 9154
+#define TLS_TEST_PORT	 9155
+#define TCPDNS_TEST_PORT 9156
+#define TLSDNS_TEST_PORT 9157
+
 typedef void (*stream_connect_function)(isc_nm_t *nm);
 typedef void (*connect_func)(isc_nm_t *);
 
@@ -119,6 +129,7 @@ extern bool allow_send_back;
 extern bool noanswer;
 extern bool stream_use_TLS;
 extern bool stream;
+extern in_port_t stream_port;
 
 extern isc_nm_recv_cb_t connect_readcb;
 
@@ -213,9 +224,6 @@ extern isc_nm_recv_cb_t connect_readcb;
 #define atomic_assert_int_ge(val, exp) assert_true(atomic_load(&val) >= exp)
 #define atomic_assert_int_gt(val, exp) assert_true(atomic_load(&val) > exp)
 
-int
-setup_ephemeral_port(isc_sockaddr_t *addr, sa_family_t family);
-
 int
 setup_netmgr_test(void **state);
 int
diff --git a/tests/isc/tcp_test.c b/tests/isc/tcp_test.c
index de25a6be8e..b76394fa6f 100644
--- a/tests/isc/tcp_test.c
+++ b/tests/isc/tcp_test.c
@@ -132,6 +132,7 @@ ISC_TEST_LIST_END
 
 static int
 tcp_setup(void **state __attribute__((__unused__))) {
+	stream_port = TCP_TEST_PORT;
 	stream_use_TLS = false;
 	stream = true;
 
diff --git a/tests/isc/tcpdns_test.c b/tests/isc/tcpdns_test.c
index 691b246846..4a66629e0c 100644
--- a/tests/isc/tcpdns_test.c
+++ b/tests/isc/tcpdns_test.c
@@ -142,4 +142,12 @@ ISC_TEST_ENTRY_CUSTOM(tcpdns_recv_send, stream_recv_send_setup,
 		      stream_recv_send_teardown)
 
 ISC_TEST_LIST_END
-ISC_TEST_MAIN
+
+static int
+tcpdns_setup(void **state __attribute__((__unused__))) {
+	stream_port = TCPDNS_TEST_PORT;
+
+	return (0);
+}
+
+ISC_TEST_MAIN_CUSTOM(tcpdns_setup, NULL)
diff --git a/tests/isc/tls_test.c b/tests/isc/tls_test.c
index 211dd6bae4..e4d7f86ea4 100644
--- a/tests/isc/tls_test.c
+++ b/tests/isc/tls_test.c
@@ -131,6 +131,7 @@ ISC_TEST_LIST_END
 
 static int
 tls_setup(void **state __attribute__((__unused__))) {
+	stream_port = TLS_TEST_PORT;
 	stream_use_TLS = true;
 	stream = true;
 
diff --git a/tests/isc/tlsdns_test.c b/tests/isc/tlsdns_test.c
index f5033fb116..2dbc3d532e 100644
--- a/tests/isc/tlsdns_test.c
+++ b/tests/isc/tlsdns_test.c
@@ -147,4 +147,12 @@ ISC_TEST_ENTRY_CUSTOM(tlsdns_recv_send, stream_recv_send_setup,
 /* FIXME: Re-add the noalpn tests */
 
 ISC_TEST_LIST_END
-ISC_TEST_MAIN
+
+static int
+tlsdns_setup(void **state __attribute__((__unused__))) {
+	stream_port = TCPDNS_TEST_PORT;
+
+	return (0);
+}
+
+ISC_TEST_MAIN_CUSTOM(tlsdns_setup, NULL)
diff --git a/tests/isc/udp_test.c b/tests/isc/udp_test.c
index 1006caa4d1..81340a2174 100644
--- a/tests/isc/udp_test.c
+++ b/tests/isc/udp_test.c
@@ -56,8 +56,6 @@ static isc_sockaddr_t udp_connect_addr;
 
 static int
 setup_test(void **state) {
-	uv_os_sock_t udp_listen_sock = -1;
-
 	setup_loopmgr(state);
 	setup_netmgr(state);
 
@@ -65,11 +63,8 @@ setup_test(void **state) {
 	isc_sockaddr_fromin6(&udp_connect_addr, &in6addr_loopback, 0);
 
 	udp_listen_addr = (isc_sockaddr_t){ .length = 0 };
-	udp_listen_sock = setup_ephemeral_port(&udp_listen_addr, SOCK_DGRAM);
-	if (udp_listen_sock < 0) {
-		return (-1);
-	}
-	isc__nm_closesocket(udp_listen_sock);
+	isc_sockaddr_fromin6(&udp_listen_addr, &in6addr_loopback,
+			     UDP_TEST_PORT);
 
 	atomic_store(&sreads, 0);
 	atomic_store(&ssends, 0);
@@ -779,6 +774,7 @@ udp__send_cb(isc_nmhandle_t *handle, isc_result_t eresult, void *cbarg) {
 			}
 		}
 		break;
+	case ISC_R_SHUTTINGDOWN:
 	case ISC_R_CANCELED:
 		break;
 	default: