1.) in /root/.curlrc is an old proxy entry → with installed curl you could not get a response

2.) in /etc/sudoers.d/root theres an unsupported char “Defaults:root \!requiretty” → “Defaults:root !requiretty”, else you get

apache : parse error in /etc/sudoers.d/root near line 2 ; TTY=unknown ; PWD=/usr/share/centreon/www ; USER=root ;

that results in the error, a poller reload/restart doesn’t get the new hosts in the ui