In order to successfully establish a connection to the Java Broker, the connection must be authenticated. The Java Broker supports a number of different authentication schemes, each with its own "authentication provider". Any number of Authentication Providers can be configured on the Broker at the same time. Only unused Authentication Provider can be deleted. For delete requests attempting to delete Authentication Provider associated with the Ports, the errors will be returned and delete operations will be aborted. It is possible to change the Authentication Provider on Port at runtime. However, the Broker restart is required for changes on Port to take effect.