|"However I use the same but in another computer and it store all the log in alerts.ids. Do you know why?"|
According to their FAQ's, it's the way you configure Snort.
The main items to be configured in IDSCenter to get it running are:
General Setup Tab
Selecting the version of Snort you are using.
Enter the path of Snort.exe.
Select process priority.
I recommend using the detection button to input your IP address and subnet.
IDS Rules Tab
Select the rules file you want to use.
Enter the name and location of the external editor you want to use.
Select your root Snort log directory.
Select your alert file type (Full or fast).
Select the level of protocol analysis (Arp, application, etc.).
Select "Start Alarm Beep" to get that audible alarm!