public boolean close () throws CIFSException {
        boolean inUse = false;

        List<SmbTransportImpl> toClose;
        synchronized ( this.connections ) {
            cleanup();
            log.debug("Closing pool");
            toClose = new LinkedList<>(this.connections);
            toClose.addAll(this.nonPooledConnections);
            this.connections.clear();
            this.nonPooledConnections.clear();