diff --git a/src/vnet/udp/udp.c b/src/vnet/udp/udp.c
index 4178a49..d5166d9 100644
--- a/src/vnet/udp/udp.c
+++ b/src/vnet/udp/udp.c
@@ -95,6 +95,7 @@
   listener->c_proto = TRANSPORT_PROTO_UDP;
   listener->c_s_index = session_index;
   listener->c_fib_index = lcl->fib_index;
+  listener->owns_port = 1;
   clib_spinlock_init (&listener->rx_lock);
 
   node_index = lcl->is_ip4 ? udp4_input_node.index : udp6_input_node.index;
@@ -168,8 +169,9 @@
   uc = udp_connection_get (connection_index, thread_index);
   if (uc)
     {
-      udp_unregister_dst_port (vm, clib_net_to_host_u16 (uc->c_lcl_port),
-			       uc->c_is_ip4);
+      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);
     }
@@ -302,6 +304,7 @@
   uc->c_is_ip4 = rmt->is_ip4;
   uc->c_proto = TRANSPORT_PROTO_UDP;
   uc->c_fib_index = rmt->fib_index;
+  uc->owns_port = 1;
 
   return uc->c_c_index;
 }
diff --git a/src/vnet/udp/udp.h b/src/vnet/udp/udp.h
index 03dbcdd..f5efbbc 100644
--- a/src/vnet/udp/udp.h
+++ b/src/vnet/udp/udp.h
@@ -41,6 +41,7 @@
   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) */
 } udp_connection_t;
 
 #define foreach_udp4_dst_port			\
@@ -234,6 +235,8 @@
   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 e42f9fa..c6b9167 100644
--- a/src/vnet/udp/udp_input.c
+++ b/src/vnet/udp/udp_input.c
@@ -207,6 +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;
 
 		  if (session_stream_accept (&child0->connection,
 					     tc0->s_index, 1))