--- lib/ns/interfacemgr.c	2019-10-02 09:24:10.000000000 +0300
+++ lib/ns/interfacemgr.c	2019-10-31 11:58:39.040623000 +0300
@@ -560,6 +560,7 @@ ns_interface_accepttcp(ns_interface_t *i
 	 * If/when there a multiple filters listen to the
 	 * result.
 	 */
+    if (isc_socket_filter(ifp->tcpsocket, "dnsready") != ISC_R_SUCCESS)
 	(void)isc_socket_filter(ifp->tcpsocket, "dataready");
 
 	result = ns_clientmgr_createclients(ifp->clientmgr, 1, ifp, true);