Configuration issues with redirects across versions of speed-of-light-ruhr.de may be causing access issues. The links below can provide alternative paths to reach the site:

http://speed-of-light-ruhr.de http://www.speed-of-light-ruhr.de https://speed-of-light-ruhr.de https://www.speed-of-light-ruhr.de

Or return to the current status page of speed-of-light-ruhr.de.