<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"> <META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7655.10"> <TITLE>Nagios did not send notification to some contacts</TITLE> </HEAD> <BODY>  Hi All, I'm looking for troubleshooting suggestions to a problem we had. During a recent host down event Nagios sent notifications to 8 of the 18 configured contacts. The contacts are configured in two contact groups, of the 8 contacts that were sent notifications all were from the same contact group but there are another 4 contacts in that group that did not get notifications sent. No contacts from the second group had notifications generated. There was a routing issue on our WAN that caused this event, the SMTP server we use is across the WAN. Could the routing issue have prevented some of the SMTP notifications from being sent, wouldn't they just queue up and go once the problem was resolved? I have seen messages that did not arrive at the recipients phone but I've never seen Nagios not generate notifications for contacts that are configured for that host or service. Has anyone else seen this, any suggestions on a cause or how to troubleshoot? Nagios 3.2.0 on RHEL 5.5 Thanks, -greg </BODY> </HTML>