Did you check the command which is used to send notifications in command.cfg or checkcommand.cfg ? Maybe you don't have the binary or you need to rename the command. By default it uses /usr/bin/printf and /usr/bin/mail if I'm not mistaken. <div class="gmail_quote">On Wed, Nov 30, 2011 at 9:23 AM, Nick Price <<a href="mailto:np121@hotmail.com">np121@hotmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> Hello I am not sure if this is a bug or config issue. I have a clean install of fedora 16 32 bit with a manual install of nagios 3.3.1 and nagios plugins 1.4.15. I see in the debug log Notification viability test failed. No notification will be sent out. I can send test emails from this server using sendmail and that bit works Is there a solution for this. Regards Nick ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. <a href="http://p.sf.net/sfu/splunk-novd2d" target="_blank">http://p.sf.net/sfu/splunk-novd2d</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>