Looks like there’s some serious problem with the “Anno 2070” servers. Players are apparently complaining that they have been unable to play the city-building and economic simulation game for two days now.

On Thursday, DSOGaming learned from “Anno 2070” players that the servers for Ubisoft’s game may be down. The news outlet reports that when players try to launch the game, they are instead greeted by an Unknown Error.

The publisher is well aware of the issue. It has even issued a statement via Ubisoft forums on Wednesday, saying that an investigation on the problem was being conducted. “We’re currently investigating the issue where you get an Unknown Error when trying to connect to ‘Anno 2070.’ … We unfortunately do not have an ETA for a fix yet,” the company’s community representative wrote.

The representative has already issued a follow-up statement, and it says: ”We’ve narrowed down the issue and are working on the solution.” As of writing, the game is still not working, to the disappointment of fans.

While Ubisoft has not shed light on the possible reasons behind this Unknown Error, some players are surmising that this may be due to “Anno 2070’s” DRM (digital rights management). Players are assuming that the copyright protection system of the game is the one responsible for the error.

DSOGaming pointed out that the pirated version of “Anno 2070” does not have a problem. But this is only because such version of the game is offline. So while the online issue continues to persist, most players have no other option than to wait for Ubisoft to nip the problem in the bud.

For the uninitiated, “Anno 2070” is a simulation game with real-time strategy elements. In this game, players can build their society, colonize islands and create sprawling megacities. They can also engineer production chains like Diamond Mines, Oil Refineries and Robot Factories.

Below is a list of the key features of the game:

A New Era
While adhering to the fundamentals that made the Anno franchise a success, the near-future setting will bring numerous new gameplay mechanics, architectural breakthroughs, and all-new challenges. Additionally, players will be able to build massive cities, the scope of which has never been seen in prior Anno games!
Become an Architect of the Future
Face the current world’s challenges to shape the world of tomorrow. You can either join the Tycoons to pursue an industrial and efficient course, or side with the Ecos to create a more sustainable and environmentally friendly direction.
An Evolving, Dynamic World
Decisions will have an impact on the environment, the architectural look of the world, and the needs of the population.
Discover Hidden Depths and New Resources
The mysteries of the sea and the sky are waiting to be discovered. Take advantage of the transport systems of the future and develop a powerful economy.
The Enhanced Anno with New Features to Master
Smuggle wares between harbors without being detected by the coastal patrols, or forge alliances with powerful figures to expand your influence.