diff --git a/src/mux_h2.c b/src/mux_h2.c
index e3e797f75..aeb91668b 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -2062,7 +2062,8 @@ static int h2c_handle_settings(struct h2c *h2c)
 	TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
 	return 1;
  fail:
-	sess_log(h2c->conn->owner);
+	if (!(h2c->flags & H2_CF_IS_BACK))
+		sess_log(h2c->conn->owner);
 	h2c_error(h2c, error);
  out0:
 	TRACE_DEVEL("leaving with missing data or error", H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
@@ -2763,7 +2764,7 @@ static int h2_frame_check_vs_state(struct h2c *h2c, struct h2s *h2s)
 		 * this state MUST be treated as a connection error
 		 */
 		h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
-		if (!h2c->nb_streams) {
+		if (!h2c->nb_streams && !(h2c->flags & H2_CF_IS_BACK)) {
 			/* only log if no other stream can report the error */
 			sess_log(h2c->conn->owner);
 		}
@@ -2914,7 +2915,8 @@ static void h2_process_demux(struct h2c *h2c)
 				if (h2c->st0 == H2_CS_ERROR) {
 					TRACE_PROTO("failed to receive settings", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_SETTINGS|H2_EV_PROTO_ERR, h2c->conn);
 					h2c->st0 = H2_CS_ERROR2;
-					sess_log(h2c->conn->owner);
+					if (!(h2c->flags & H2_CF_IS_BACK))
+						sess_log(h2c->conn->owner);
 				}
 				goto fail;
 			}
@@ -2924,7 +2926,8 @@ static void h2_process_demux(struct h2c *h2c)
 				TRACE_PROTO("unexpected frame type or flags", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_SETTINGS|H2_EV_PROTO_ERR, h2c->conn);
 				h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
 				h2c->st0 = H2_CS_ERROR2;
-				sess_log(h2c->conn->owner);
+				if (!(h2c->flags & H2_CF_IS_BACK))
+					sess_log(h2c->conn->owner);
 				goto fail;
 			}
 
@@ -2933,7 +2936,8 @@ static void h2_process_demux(struct h2c *h2c)
 				TRACE_PROTO("invalid settings frame length", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_SETTINGS|H2_EV_PROTO_ERR, h2c->conn);
 				h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
 				h2c->st0 = H2_CS_ERROR2;
-				sess_log(h2c->conn->owner);
+				if (!(h2c->flags & H2_CF_IS_BACK))
+					sess_log(h2c->conn->owner);
 				goto fail;
 			}
 
@@ -2970,7 +2974,7 @@ static void h2_process_demux(struct h2c *h2c)
 			if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
 				TRACE_PROTO("invalid H2 frame length", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn);
 				h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
-				if (!h2c->nb_streams) {
+				if (!h2c->nb_streams && !(h2c->flags & H2_CF_IS_BACK)) {
 					/* only log if no other stream can report the error */
 					sess_log(h2c->conn->owner);
 				}
@@ -2989,7 +2993,8 @@ static void h2_process_demux(struct h2c *h2c)
 				if (hdr.len < 1) {
 					TRACE_PROTO("invalid H2 padded frame length", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn);
 					h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
-					sess_log(h2c->conn->owner);
+					if (!(h2c->flags & H2_CF_IS_BACK))
+						sess_log(h2c->conn->owner);
 					goto fail;
 				}
 				hdr.len--;
@@ -3005,7 +3010,8 @@ static void h2_process_demux(struct h2c *h2c)
 					 * frame payload or greater => error.
 					 */
 					h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
-					sess_log(h2c->conn->owner);
+					if (!(h2c->flags & H2_CF_IS_BACK))
+						sess_log(h2c->conn->owner);
 					goto fail;
 				}
 
@@ -3031,7 +3037,8 @@ static void h2_process_demux(struct h2c *h2c)
 			if (ret != H2_ERR_NO_ERROR) {
 				TRACE_PROTO("received invalid H2 frame header", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn);
 				h2c_error(h2c, ret);
-				sess_log(h2c->conn->owner);
+				if (!(h2c->flags & H2_CF_IS_BACK))
+					sess_log(h2c->conn->owner);
 				goto fail;
 			}
 		}
@@ -3104,7 +3111,8 @@ static void h2_process_demux(struct h2c *h2c)
 			 */
 			TRACE_PROTO("received unexpected H2 CONTINUATION frame", H2_EV_RX_FRAME|H2_EV_RX_CONT|H2_EV_H2C_ERR, h2c->conn, h2s);
 			h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
-			sess_log(h2c->conn->owner);
+			if (!(h2c->flags & H2_CF_IS_BACK))
+				sess_log(h2c->conn->owner);
 			goto fail;
 
 		case H2_FT_HEADERS:
@@ -3241,10 +3249,8 @@ static int h2_process_mux(struct h2c *h2c)
 		if (unlikely(h2c->st0 == H2_CS_PREFACE && (h2c->flags & H2_CF_IS_BACK))) {
 			if (unlikely(h2c_bck_send_preface(h2c) <= 0)) {
 				/* RFC7540#3.5: a GOAWAY frame MAY be omitted */
-				if (h2c->st0 == H2_CS_ERROR) {
+				if (h2c->st0 == H2_CS_ERROR)
 					h2c->st0 = H2_CS_ERROR2;
-					sess_log(h2c->conn->owner);
-				}
 				goto fail;
 			}
 			h2c->st0 = H2_CS_SETTINGS1;