I am trying to set up a queue to manage traffic to an application on the server that only accepts 250 concurrent users at one time. How would I set up the redirect on the load balancer to redirect the first user that exceeds the 250 concurrent users to a page, for example, that would say "Your request cannot be executed at this time".

The load balancer is an F5 BigIP and the two servers are running Microsoft Server 2003.