public boolean isDisconnected() {
        final Socket s = this.socket;
        return super.isDisconnected() || s == null || s.isClosed();
    }

    @Override
    public boolean isFailed() {
        final Socket s = this.socket;
        return super.isFailed() || s == null || s.isClosed();
    }

    @Override
    public boolean hasCapability(final int cap) throws SmbException {