After a power failure the network devices need to startup. The Hitit central computer has a shorter startup time as the network devices. When the hitit serverprogram starts before the network is available the program will give an error. At installatiion this program starts with a 5 minute delay. In some cases this delay is not enough. To fix the problem just diconnect the power from the central computer and connect it again. After about 5 minutes hitit should start up.