I have an interesting issue when using the Nagios plugin to make an SNMP query to a Netscreen 208. I have two Nagios servers -- Gentoo and CentOS -- and one of the check_snmp commands are not working on CentOS server (Nagios03) when I run it *exactly* from the command line like I do in Gentoo (Nagios01) e.g. From CentOS (does not work) [root@nagios03 plugins]# pwd /usr/lib/nagios/plugins [root@nagios03 plugins]# ./check_snmp -C myPublicString -o nsVpnMonP2State.0 -l DC_VPN_Status -c 1: -H <a href="http://10.0.11.9">10.0.11.9</a> DC_VPN_Status problem - No data received from host CMD: /usr/bin/snmpget -t 1 -r 5 -m ALL -v 1 -c myPublicString <a href="http://10.0.11.9:161">10.0.11.9:161</a> nsVpnMonP2State.0 From Gentoo (works) nagios01 libexec # pwd /usr/nagios/libexec nagios01 libexec # ./check_snmp -C myPublicString -o nsVpnMonP2State.0 -l DC_VPN_Status -c 1: -H <a href="http://10.0.11.9">10.0.11.9</a> DC_VPN_Status OK - 1 | NETSCREEN-VPN-MON-MIB::nsVpnMonP2State.0=1;;;; Normally, I'd think that it is an issue with the polled device not being configured properly, but since I can 'snmpwalk' it from the CentOS box in question, I'm not sure what to do. Any suggestions?