A great difficulty with setting up a server is that you can only test your work within the given infrastructure. As you can probably imagine, we do not have our data centres cloned here in the office in Regensburg. So there is always a small risk when a new server goes live, for example. While it was tested inhouse and running well, it then has to function properly in the infrastructure of the data centre, too.
Not only is the infrastructure different, though, but also the conditions. When a new server is tested inhouse, you cannot simulate hundreds of players playing, players who are creative and who try out all sorts of things that nobody could anticipate. So obviously errors can occur, even though our team is trying to prevent them from happening to the best of their possibilities.