Redirect To Website

I don't think you can. Since the connection is encrypted and the F5 knows nothing about what is inside the connection, it can not insert any HTTP functions. Only two ways I can think of. Both invloved sending them to a http server that will accept the same SSL server and send a "out of service" page no matter what the URI.

Method one would be to add the "out of service" server to the current pool, but use priority groups so that it is only selected when all of the other servers are down.

Method two is put this in your iRule:

when CLIENT_ACCEPTED {
      if { [active_members current_pool] == 0 } {
        pool where_you_want_them_to_go
      }
    }