diff --git a/src/modules/module-client-node/client-node.c b/src/modules/module-client-node/client-node.c
index b7f91f328..8502a735f 100644
--- a/src/modules/module-client-node/client-node.c
+++ b/src/modules/module-client-node/client-node.c
@@ -617,11 +617,12 @@ impl_node_port_set_io(struct spa_node *node,
 		if ((mem = pw_memblock_find(data)) == NULL)
 			return -EINVAL;
 
-		mem_offset = mem->offset;
+		mem_offset = SPA_PTRDIFF(data, mem->ptr);
 		mem_size = mem->size;
 		if (mem_size - mem_offset < size)
 			return -EINVAL;
 
+		mem_offset += mem->offset;
 		m = ensure_mem(impl, mem->fd, t->data.MemFd, mem->flags);
 		memid = m->id;
 	}
@@ -965,7 +966,7 @@ client_node_done(void *data, int seq, int res)
 	struct impl *impl = data;
 	struct node *this = &impl->node;
 
-	if (seq == 0 && res == 0)
+	if (seq == 0 && res == 0 && impl->transport == NULL)
 		setup_transport(impl);
 
 	this->callbacks->done(this->callbacks_data, seq, res);
@@ -1144,6 +1145,8 @@ node_init(struct node *this,
 	this->data_source.mask = SPA_IO_IN | SPA_IO_ERR | SPA_IO_HUP;
 	this->data_source.rmask = 0;
 
+	this->seq = 1;
+
 	return SPA_RESULT_RETURN_ASYNC(this->seq++);
 }