diff --git a/src/vnet/udp/udp.c b/src/vnet/udp/udp.c
index 7dd0d2a..949c635 100644
--- a/src/vnet/udp/udp.c
+++ b/src/vnet/udp/udp.c
@@ -63,6 +63,18 @@
     clib_memset (uc, 0xFA, sizeof (*uc));
 }
 
+void
+udp_connection_delete (udp_connection_t * uc)
+{
+  if ((uc->flags & UDP_CONN_F_OWNS_PORT)
+      || !(uc->flags & UDP_CONN_F_CONNECTED))
+    udp_unregister_dst_port (vlib_get_main (),
+			     clib_net_to_host_u16 (uc->c_lcl_port),
+			     uc->c_is_ip4);
+  session_transport_delete_notify (&uc->connection);
+  udp_connection_free (uc);
+}
+
 u32
 udp_session_bind (u32 session_index, transport_endpoint_t * lcl)
 {
@@ -95,7 +107,7 @@
   listener->c_proto = TRANSPORT_PROTO_UDP;
   listener->c_s_index = session_index;
   listener->c_fib_index = lcl->fib_index;
-  listener->owns_port = 1;
+  listener->flags |= UDP_CONN_F_OWNS_PORT;
   clib_spinlock_init (&listener->rx_lock);
 
   node_index = lcl->is_ip4 ? udp4_input_node.index : udp6_input_node.index;
@@ -148,6 +160,12 @@
   vnet_buffer (b)->sw_if_index[VLIB_TX] = uc->c_fib_index;
   b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
 
+  if (PREDICT_FALSE (uc->flags & UDP_CONN_F_CLOSING))
+    {
+      if (!transport_max_tx_dequeue (&uc->connection))
+	udp_connection_delete (uc);
+    }
+
   return 0;
 }
 
@@ -164,17 +182,16 @@
 void
 udp_session_close (u32 connection_index, u32 thread_index)
 {
-  vlib_main_t *vm = vlib_get_main ();
   udp_connection_t *uc;
+
   uc = udp_connection_get (connection_index, thread_index);
-  if (uc)
-    {
-      if (uc->owns_port || !uc->is_connected)
-	udp_unregister_dst_port (vm, clib_net_to_host_u16 (uc->c_lcl_port),
-				 uc->c_is_ip4);
-      session_transport_delete_notify (&uc->connection);
-      udp_connection_free (uc);
-    }
+  if (!uc)
+    return;
+
+  if (!transport_max_tx_dequeue (&uc->connection))
+    udp_connection_delete (uc);
+  else
+    uc->flags |= UDP_CONN_F_CLOSING;
 }
 
 void
@@ -308,7 +325,7 @@
   uc->c_is_ip4 = rmt->is_ip4;
   uc->c_proto = TRANSPORT_PROTO_UDP;
   uc->c_fib_index = rmt->fib_index;
-  uc->owns_port = 1;
+  uc->flags |= UDP_CONN_F_OWNS_PORT;
 
   return uc->c_c_index;
 }
@@ -362,7 +379,7 @@
   if (uc_index == (u32) ~ 0)
     return -1;
   uc = udp_connection_get (uc_index, thread_index);
-  uc->is_connected = 1;
+  uc->flags |= UDP_CONN_F_CONNECTED;
   return uc_index;
 }
 
@@ -375,7 +392,7 @@
   if (li_index == (u32) ~ 0)
     return -1;
   listener = udp_listener_get (li_index);
-  listener->is_connected = 1;
+  listener->flags |= UDP_CONN_F_CONNECTED;
   return li_index;
 }
 
diff --git a/src/vnet/udp/udp.h b/src/vnet/udp/udp.h
index f5efbbc..88a46db 100644
--- a/src/vnet/udp/udp.h
+++ b/src/vnet/udp/udp.h
@@ -34,14 +34,20 @@
   UDP_N_ERROR,
 } udp_error_t;
 
+typedef enum
+{
+  UDP_CONN_F_CONNECTED,		/**< connected mode */
+  UDP_CONN_F_OWNS_PORT,		/**< port belong to conn (UDPC) */
+  UDP_CONN_F_CLOSING,		/**< conn closed with data */
+} udp_conn_flags_t;
+
 typedef struct
 {
   /** Required for pool_get_aligned */
   CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
   transport_connection_t connection;	/**< must be first */
   clib_spinlock_t rx_lock;		/**< rx fifo lock */
-  u8 is_connected;			/**< connected mode */
-  u8 owns_port;				/**< does port belong to conn (UDPC) */
+  u8 flags;				/**< connection flags */
 } udp_connection_t;
 
 #define foreach_udp4_dst_port			\
@@ -235,7 +241,6 @@
   udp_pool_remove_peeker (thread_index);
   new_c->c_thread_index = current_thread_index;
   new_c->c_c_index = udp_connection_index (new_c);
-  new_c->is_connected = old_c->is_connected;
   new_c->c_fib_index = old_c->c_fib_index;
   return new_c;
 }
diff --git a/src/vnet/udp/udp_input.c b/src/vnet/udp/udp_input.c
index cc5ae2b..f6d89dc 100644
--- a/src/vnet/udp/udp_input.c
+++ b/src/vnet/udp/udp_input.c
@@ -162,7 +162,7 @@
 	       */
 	      tc0 = session_get_transport (s0);
 	      uc0 = udp_get_connection_from_transport (tc0);
-	      if (uc0->is_connected)
+	      if (uc0->flags & UDP_CONN_F_CONNECTED)
 		{
 		  /*
 		   * Clone the transport. It will be cleaned up with the
@@ -190,7 +190,7 @@
 	    {
 	      tc0 = listen_session_get_transport (s0);
 	      uc0 = udp_get_connection_from_transport (tc0);
-	      if (uc0->is_connected)
+	      if (uc0->flags & UDP_CONN_F_CONNECTED)
 		{
 		  child0 = udp_connection_alloc (my_thread_index);
 		  if (is_ip4)
@@ -207,7 +207,7 @@
 		  child0->c_rmt_port = udp0->src_port;
 		  child0->c_is_ip4 = is_ip4;
 		  child0->c_fib_index = tc0->fib_index;
-		  child0->is_connected = 1;
+		  child0->flags |= UDP_CONN_F_CONNECTED;
 
 		  if (session_stream_accept (&child0->connection,
 					     tc0->s_index, tc0->thread_index,