I have verified that only one process of nagios is running. I have also restarted the machine. All the other cgi's are working fine. Only the part of Host Status Tools is showing incorrect numbers. It should show something like Up-25, Down-2,etc. but all the numbers are zero. If i click on Up or Down, it shows the hosts which are up or down but the numbers are still appearing zero. All the other cgi's are working fine. The Service Status Tools, which is right next to Host Status Tools, is showing the right numbers.