Error: Could not open command file '/usr/local/nagios/var/rw/nagios.cmd' for update!

[Lance Boon]

Yes I did. It still gives me the same error message could not open
file....

Presuming that your web server runs as the user 'nobody', did you
restart apache _after_ adding it to the nagios group? It's not clear
that's one of the suggestions you found and tried.

--
Marc

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