diff --git a/lib/pdu.c b/lib/pdu.c
index 4ae3139..b5e57fe 100644
--- a/lib/pdu.c
+++ b/lib/pdu.c
@@ -59,6 +59,14 @@ iscsi_itt_post_increment(struct iscsi_context *iscsi) {
 	return old_itt;
 }
 
+void iscsi_dump_pdu_header(struct iscsi_context *iscsi, unsigned char *data) {
+	char dump[ISCSI_RAW_HEADER_SIZE*3+1]={0};
+	int i;
+	for (i=0;i<ISCSI_RAW_HEADER_SIZE;i++) {
+		snprintf(&dump[i*3], 4," %02x",data[i]);
+	}
+	ISCSI_LOG(iscsi, 0, "PDU header:%s",dump);
+}
 
 struct iscsi_pdu *
 iscsi_allocate_pdu_with_itt_flags(struct iscsi_context *iscsi, enum iscsi_opcode opcode,
@@ -291,6 +299,10 @@ int iscsi_process_reject(struct iscsi_context *iscsi,
 
 	itt = scsi_get_uint32(&in->data[16]);
 
+	if (iscsi->log_level > 1) {
+		iscsi_dump_pdu_header(iscsi, in->data);
+	}
+
 	for (pdu = iscsi->waitpdu; pdu; pdu = pdu->next) {
 		if (pdu->itt == itt) {
 			break;
diff --git a/lib/socket.c b/lib/socket.c
index b448ff5..c30f862 100644
--- a/lib/socket.c
+++ b/lib/socket.c
@@ -61,13 +61,11 @@ iscsi_add_to_outqueue(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
 		return;
 	}
 	
-	/* queue pdus in ascending order of itt. 
-	 * ensure that pakets with the same itt are kept in order.
-	 * queue pdus with itt = 0xffffffff (SNACK / DataACK) in order but at head of queue.
+	/* queue pdus in ascending order of CmdSN. 
+	 * ensure that pakets with the same CmdSN are kept in FIFO order.
 	 */
 	do {
-		if (iscsi_serial32_compare(pdu->itt, current->itt) < 0 
-			|| (pdu->itt == 0xffffffff && current->itt != 0xffffffff)) {
+		if (iscsi_serial32_compare(pdu->cmdsn, current->cmdsn) < 0) {
 			/* insert PDU before the current */
 			if (last != NULL) {
 				last->next=pdu;