if all server in server farm are down, can you configure ACE 4710 to respond with static html page? I like ACE respond to client with simple massege when we are doing maintenance or if all webservers become unavialable. something like " we are down for maintenance, please try later".
To do this you need to add a backup server to porvide a sorry service, this does require another physical server, the ace will not respond with html pages.
What it will do is see that all the PRIMARY webservers are down and forward requests onto a backup server which can be setup to display a friendly page.
Hope this helps