[Roman Meier] > Is there another way to synchronize the time e.g. with the server > instead of the internet?
In earlier times, all clients had their /etc/ntp.conf file set up to synchronise their clocks with the server, for just this kind of scenario. Is this no longer the case? Look for the 'server' lines on the client and server. -- Happy hacking Petter Reinholdtsen