NLexch has been closed after a long time of keeping providing an unreachable web page. The company loaded the network again just to be reliable and give its users as well as interested explorer the chance of confirm it was deleted from the web. Now, there isn't absolute way of trading there anymore.
Anyways, trading there was never as efficient as you might think. It is a fact that this European service did not go well in liquidity, and that was a factor that contributed to the quick closure of all its services. Since the company did not have capital for boosting the page, no partners wanted to offer help as well.