Nagios Support Forum

I am new to nagios and linux and am haveing trouble. When i try and perfrom and tasks like force a service check or acknowledge a problem i get an error that reads "Error: could not open command file '/var/nagios/rw/nagios.cmd' for update

I had the same issue. I added the apache user to the nagios group and it worked fine after that.

sudo usermod -a -G nagios apache