I've just finished configuring nagios, and everything was working fine until I changed one config from a host (just config files, never nagios files). And when I applied changes (service nagios3 reload) the web interface to monitor nagios failed.
Error: Could not read host and service status information!
I took a look into log files /var/log/nagios3/nagios.log and I found that:
 Nagios 3.0.6 starting... (PID=1325)
 Local time is Mon Apr 19 11:18:26 CEST 2010
 LOG VERSION: 2.0
 Finished daemonizing... (New PID=1344)
 Error: Could not create external command file '/var/lib/nagios3/rw/nagios.cmd' as named pipe: (13) -> Permission denied.
If this file already exists and you are sure that another copy of Nagios is not running, you should delete this file.
 Bailing out due to errors encountered while trying to initialize the external command file... (PID=1344)
I've checked permisions into that folder (owner nagios) and there is no file inside.
Any idea? (nagios version 3.0.6 under ubuntu 9.10 x32).
Thanks in advance,