A user’s authentication remains on the real (authentication) server cluster member that originally handled the user’s authentication. If this server malfunctions, all users whose authentication data resides on this cluster member must re-authenticate unless you have enabled session failover. For more information about this feature, see Configuring Session Failover.
Requests that require user authentication information are processed on this server. When the system identifies a server as not being the real server, the HTTP request is forwarded to the appropriate cluster member, which processes the request and returns it to the requesting server.