@Override
    public void notifyAuthenticationFailed(Credentials credentials)
            throws GuacamoleException {
        // Do nothing
    }
AuthenticationFailureTracker implementation that does nothing. All requests
are ignored, regardless of status, and no tracking is performed.
extensions/guacamole-auth-ban/src/main/java/org/apache/guacamole/auth/ban/status/NullAuthenticationFailureTracker.java