diff --git a/src/proto_http.c b/src/proto_http.c
index 61ce7ba..70b3a13 100644
--- a/src/proto_http.c
+++ b/src/proto_http.c
@@ -2488,7 +2488,7 @@
 		req->flags |= CF_READ_DONTWAIT; /* try to get back here ASAP */
 		s->rep->flags &= ~CF_EXPECT_MORE; /* speed up sending a previous response */
 #ifdef TCP_QUICKACK
-		if (s->listener->options & LI_O_NOQUICKACK && req->buf->i && objt_conn(s->req->prod->end)) {
+		if (s->listener->options & LI_O_NOQUICKACK && req->buf->i && objt_conn(s->req->prod->end) && (__objt_conn(s->req->prod->end)->flags & CO_FL_CTRL_READY)) {
 			/* We need more data, we have to re-enable quick-ack in case we
 			 * previously disabled it, otherwise we might cause the client
 			 * to delay next data.
@@ -3015,13 +3015,13 @@
 			break;
 
 		case HTTP_REQ_ACT_SET_TOS:
-			if ((cli_conn = objt_conn(s->req->prod->end)))
+			if ((cli_conn = objt_conn(s->req->prod->end)) && (cli_conn->flags & CO_FL_CTRL_READY))
 				inet_set_tos(cli_conn->t.sock.fd, cli_conn->addr.from, rule->arg.tos);
 			break;
 
 		case HTTP_REQ_ACT_SET_MARK:
 #ifdef SO_MARK
-			if ((cli_conn = objt_conn(s->req->prod->end)))
+			if ((cli_conn = objt_conn(s->req->prod->end)) && (cli_conn->flags & CO_FL_CTRL_READY))
 				setsockopt(cli_conn->t.sock.fd, SOL_SOCKET, SO_MARK, &rule->arg.mark, sizeof(rule->arg.mark));
 #endif
 			break;
@@ -3101,13 +3101,13 @@
 			break;
 
 		case HTTP_RES_ACT_SET_TOS:
-			if ((cli_conn = objt_conn(s->req->prod->end)))
+			if ((cli_conn = objt_conn(s->req->prod->end)) && (cli_conn->flags & CO_FL_CTRL_READY))
 				inet_set_tos(cli_conn->t.sock.fd, cli_conn->addr.from, rule->arg.tos);
 			break;
 
 		case HTTP_RES_ACT_SET_MARK:
 #ifdef SO_MARK
-			if ((cli_conn = objt_conn(s->req->prod->end)))
+			if ((cli_conn = objt_conn(s->req->prod->end)) && (cli_conn->flags & CO_FL_CTRL_READY))
 				setsockopt(cli_conn->t.sock.fd, SOL_SOCKET, SO_MARK, &rule->arg.mark, sizeof(rule->arg.mark));
 #endif
 			break;
@@ -3930,7 +3930,7 @@
 		 * the client to delay further data.
 		 */
 		if ((s->listener->options & LI_O_NOQUICKACK) &&
-		    cli_conn &&
+		    cli_conn && (cli_conn->flags & CO_FL_CTRL_READY) &&
 		    ((msg->flags & HTTP_MSGF_TE_CHNK) ||
 		     (msg->body_len > req->buf->i - txn->req.eoh - 2)))
 			setsockopt(cli_conn->t.sock.fd, IPPROTO_TCP, TCP_QUICKACK, &one, sizeof(one));