Please, I need on how to configure hosts on nagios (localhost.cfg). I already configured nagios and apache (httpd.conf) and everything is fine I can reach nagios from other PCs on the network with url, but I have only one host, the localhost found in the template. Anytime I make any changes to the file in attempt to add a new host, Nagios will not restart, instead I wil get the error message: " CONFIG ERROR! Start aborted. Check your Nagios configuration." . I feel I don't know how to add new hosts to the localhost.cfg file. PLEASE HELP ME.