Hello, They may not be mandatory, but I think they are used in notifications -- for example, if a contact for the host is to be notified by email if the host goes down and the host does go down, the message says something like '<hostalias>/ping is CRITICAL'. I may not be correct here... put in a dummy host with no alias and see what the notification says. Cheers, Guy. <div class="gmail_quote">On Tue, Jul 21, 2009 at 4:01 PM, L B <<a href="mailto:bertignac@gmail.com">bertignac@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Hello, In the documentation, host aliases are in red, so mandatory, but it works without configuring them.Can I have problems if I don't define them ? I have a database with host descriptions, and I want to avoid duplicating data. If aliases have to be defined, I will just define something like "foo" Is the error in the config checker or in the documentation ? Thanks -- L.B. ------------------------------------------------------------------------------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: <a href="http://p.sf.net/sfu/Challenge" target="_blank">http://p.sf.net/sfu/Challenge</a> _______________________________________________ Nagios-users mailing list <a href="mailto:Nagios-users@lists.sourceforge.net">Nagios-users@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/nagios-users" target="_blank">https://lists.sourceforge.net/lists/listinfo/nagios-users</a> ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null </blockquote></div>