Hi All, I am in the process of setting up nagios 1.3 for my network monitoring requirements. I have reached the stage where I get an email notification when the host in question fails. But my observation is that when the host comes back up no email notification is sent by nagios. My basic setup of nagios consists of one monitored host with monitored service (http service) on it. I neither get any service notification when the host goes down, nor do I get any host/service notification when the host comes back up. Which area of nagios configuration should I check to find out the problem ? The text that I find in nagios.log is below. [1135597628] Nagios 1.3 starting... (PID=19908) [1135597938] HOST ALERT: lab;DOWN;SOFT;1;<wrta> was not set [1135597939] HOST ALERT: lab;DOWN;SOFT;2;<wrta> was not set [1135597939] HOST ALERT: lab;DOWN;SOFT;3;<wrta> was not set [1135597939] HOST ALERT: lab;DOWN;SOFT;4;<wrta> was not set [1135597939] HOST ALERT: lab;DOWN;HARD;5;<wrta> was not set [1135597939] HOST NOTIFICATION: yogesh;lab;DOWN;host-notify-by-email;wrta was not set [1135597939] SERVICE ALERT: lab;check-http;CRITICAL;HARD;1;Name or service not known [1135600038] HOST NOTIFICATION: yogesh;lab;DOWN;host-notify-by-email;wrta was not set Thanks In Advance Yogesh