Aspern returns HTTP 404 for correct URLs

HTTP Status 404 - 
 
type Status report
 
message 
 
description The requested resource () is not available.
 
Apache Tomcat/6.0.35
 
 
for well known urls, like a http://aspern.airlinesim.aero/

Same like here: http://community.airlinesim.aero/topic/7121-fornebu/