Nagios Problema

[Arturo Neira]

Hola linuxeros , primero que nada gracias a todos los que puedan ayudarme..

en debian he instalado nagios, puedo entrar, sin problemas, el
problema que tengo es que no puedo ver las pantallas de monitoreo me
muestra el sig error:

Whoops!

Error: Could not read host and service status information!

The most common cause of this error message (especially for new
users), is the fact that Nagios is not actually running. If Nagios is
indeed not running, this is a normal error message. It simply
indicates that the CGIs could not obtain the current status of hosts
and services that are being monitored. If you've just installed
things, make sure you read the documentation on starting Nagios.

Some other things you should check in order to resolve this error include:

   1. Check the Nagios log file for messages relating to startup or
status data errors.
   2. Always verify configuration options using the -v command-line
option before starting or restarting Nagios!
   3. Make sure you've compiled the main program and the CGIs to use
the same status data storage options (i.e. text file or database). If
the main program is storing status data in a text file and the CGIs
are trying to read status data from a database, you'll have problems.

Make sure you read the documentation on installing, configuring and
running Nagios thoroughly before continuing. If all else fails, try
sending a message to one of the mailing lists. More information can be
found at http://www.nagios.org.

compilo la instalacion de nagios con 
 nagios -v /etc/nagios/nagios.cfg
y  me sale todo bien 0 errores y 0 warnings

bueno gracias a todos nuevamente..