Resolving Nagios Error: Could not open command file ‘/usr/local/nagios/var/rw/nagios.cmd’ for update! by Jeff Staten • November 20, 2013 • 6 Comments Cannot Run Nagios Service Commands – Could not open command file Error After installing Nagios, everything may appear to be up and running just fine until you attempt to run a service command such as “Re-schedule the next check of this… Read more →