<!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 6.5.7036.0"> <TITLE>Down when it is up</TITLE> </HEAD> <BODY>  Nagios (Ver. 1.2) was just installed to monitor a VPN with 600 ATMs. ATMs are connected through ISDN and they have a redundant dial-up line. The problem we have is that some of the ATMs are shown as down but when pinged the are really up. This happens in the ATMs that for any reason, are working with the dial-up lines. Our consultant has stated that there is a bandwidth problem, but it has been demonstrated that it is not the case. Reading the documentation it seems to me that the problem is the configuration. Is there anything we can check? One ATM has the following parameters: X98932 ... max_check_attempts 10 Notification_interval 120 Notification_period 24x7 Notification_options d,u,r Chck_command chec-host-alive ... regards Luis Alfonso Franco Ruiz </BODY> </HTML>