After downloading a Lightstreamer Moderato installation version, we try install it on Ubuntu 7.1 Linux Server. Our operation steps as below:
1) Getting a free lience for our server MAC
2) Configuring the lightstreamer_conf.xml
3) Download the ***EzI6BlcQCbAInm7K.lic file and located at Lightstreamer_home\conf Dir
4) Restart LS

Current result:
There are not ***I6BlcQCbAInm7K.signature and *****EzI6BlcQCbAInm7K.audit files at Lightstreamer_home\audit Dir. So the Server shut down after one hour from startup and three times per hour a message was broadcast to connected clients.

How come this problem occured ?