I'm trying to install open-xchange with Fedora Core 7. Everything compiled without errors. When I try to start the admindaemon I get the following error in the log:

SEVERE: Could not create sender to [] -- Socket is null, cannot connect to
Sep 26, 2007 1:19:33 PM org.apache.jcs.auxiliary.lateral.socket.tcp.Latera lTCPCacheManager <init>
SEVERE: Failure, lateral instance will use zombie service
java.io.IOException: Socket is null, cannot connect to
I already installed everything twice. All the jar files are there. Is it possible, that the maildomain has to be valid in the dns? I only put it in the /etc/hosts file at the moment until everything works and the system can receive emails without problems.

If anyone has another idea please let me know.