Connection Abort on Key Auth causes problem on reconnect

I'm using SSH.NET v2016.1.0 to connect to many UNIX servers. We have logic to retry connecting if an attempt fails. One of the servers uses keyboard authentication and intermittently aborts the connection during login. We have not found the cause of abort but that is not of concern here. When an abort occurs, the ConnectionInfo object is not being properly disposed when the client is Disconnected or Disposed. This is causing subsequent connection attempts to fail with client is not connected errors or errant events to be logged.

Renci.SshNet.Common.SshConnectionException: An established connection was aborted by the server.
at Renci.SshNet.Session.WaitOnHandle(WaitHandle waitHandle, TimeSpan timeout)
at Renci.SshNet.KeyboardInteractiveAuthenticationMethod.Authenticate(Session session)
at Renci.SshNet.ClientAuthentication.TryAuthenticate(ISession session, AuthenticationState authenticationState, String[] allowedAuthenticationMethods, SshAuthenticationException& authenticationException)
at Renci.SshNet.ClientAuthentication.Authenticate(IConnectionInfoInternal connectionInfo, ISession session)
at Renci.SshNet.ConnectionInfo.Authenticate(ISession session, IServiceFactory serviceFactory)
at Renci.SshNet.Session.Connect()
at Renci.SshNet.BaseClient.Connect()

We have worked around by recreating the ConnectionInfo object on each attempt and unsubscribing handlers for the AuthenticationPrompt and AuthenticationBanners events before Disposing the client when a failure occurs.

private void DisposeClient(BaseClient client)
        {
            if (client != null)
            {
                if (client.ConnectionInfo != null)
                {
                    // Unregister events
                    foreach (AuthenticationMethod authenticationMethod in client.ConnectionInfo.AuthenticationMethods)
                    {
                        if (authenticationMethod is KeyboardInteractiveAuthenticationMethod)
                        {                            
                       ((KeyboardInteractiveAuthenticationMethod)authenticationMethod).AuthenticationPrompt -= KeyboardInteractive_AuthenticationPrompt;
                            break;
                        }
                    }

                    client.ConnectionInfo.AuthenticationBanner -= ConnectionInfo_AuthenticationBanner;
                }

                client.Dispose();

                client = null;
            }
        }

Comienza rastreando BaseClient.Dispose y Disconnect a través de ConnectionInfo, Session.Connect y KeyboardInteractiveAuthenticationMethod.Authenticate, centrándote en la ruta de inicio de sesión abortado que se muestra en el stack trace. Comprueba cómo se conservan los controladores de eventos de autenticación y el estado de la conexión después de un aborto. Se considera terminado cuando desechar o volver a conectar después de un intento fallido de autenticación por teclado no produce eventos obsoletos ni errores client-is-not-connected.