LS-XL webaccess and Airport Express

[fatboylo]

I have manually set up my LS-XL web access using ports 9000 (for both external and internal) to allow web access. I went to my Airport express and enabled port mapping on public & private ports 9000 for both UDP & TCP. It worked briefly yesterday and now it is refusing to work on both LAN and WAN. I have tried multiple things (changing the port numbers, restarting both the NAS and router, etc) but it just gives " the server can not be found". Any ideas???