Hi Peter,

Thx for your answer and its check-list... which helped me to find my mistake and to solve the problem

when you run the agent manually on the affected server, does it return an output /usr/lib/observium_agent/local/apache <<<apache>>> 56775

No.

If not, do you use vhosts ?

Yes

B-) but I had not enabled the default site. As soon as I did, things worked perfectly

Date: Fri, 24 Jun 2016 08:50:20 +1000 From: Peter.Hine@familycourt.gov.au To: Observium Network Observation System observium@observium.org Subject: Re: [Observium] One of my Apache servers do not show [SEC=UNCLASSIFIED] when you run the agent manually on the affected server, does it return an output /usr/lib/observium_agent/local/apache <<<apache>>> 56775 [...]

...

...

If not, do you use vhosts ? does mod_security.conf need updating to allow access from localhost. do you get a perl error on LWP:Simple ?

thanks