When distributing connection requests for fault-tolerant and load-balanced AppServers, the controlling NameServer assumes that all AppServer instances that support the same application service also support the same API. The NameServer does not validate this assumption. You must ensure that the same published API is available on all AppServer instances that register the same application service name with a NameServer. For more information on fault-tolerant and load-balanced AppServers, see the information on AppServer administration in OpenEdge Application Server: Administration. For more information on how OpenEdge manages connection requests for fault-tolerant and load-balanced AppServers, see the information on session models and application services in OpenEdge Application Server: Developing AppServer Applications.