Hi every one, We are monitoring resources with nagios using snmp plugins. I am facing issues on few machines but rest all are ok. They have the same config but I don't know what is wrong. I tried as much as I could but couldn't fix it. Here is the rpms installed on this client [root@w2 ~]# rpm -qa | grep snmp net-snmp-libs-126.96.36.199-7.el5_4.2 net-snmp-188.8.131.52-7.el5_4.2 net-snmp-utils-184.108.40.206-7.el5_4.2 The config file is [root@w2 ~]# cat /etc/snmp/snmpd.conf rocommunity secret [root@w2 ~]# lsof -i :161 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME snmpd 13458 root 10u IPv4 292733053 UDP *:snmp [root@w2 ~]# /etc/init.d/snmpd status snmpd (pid 1345 is running... but when I test [root@w2 ~]# snmpwalk -v 1 -c secret localhost .220.127.116.11.18.104.22.168.0 Timeout: No Response from localhost [root@w2 ~]# snmpget -v1 -c secret 127.0.0.1 system.sysDescr.0 Timeout: No Response from 127.0.0.1. See the output on one of the other client where it is working [root@w5 ~]# snmpwalk -v 1 -c streamuk localhost .22.214.171.124.126.96.36.199.0 SNMPv2-MIB::sysDescr.0 = STRING: Linux w5.mycompany.com 2.6.18-164.9.1.el5 #1 SMP Tue Dec 15 21:04:57 EST 2009 i686 [root@w5 ~]# snmpget -v1 -c streamuk 127.0.0.1 system.sysDescr.0 SNMPv2-MIB::sysDescr.0 = STRING: Linux w5.mycompany.com 2.6.18-164.9.1.el5 #1 SMP Tue Dec 15 21:04:57 EST 2009 i686 The same config is working for all clients but have problems with few machines. May be I am doing something wrong in config or testing at very basic level. Can any body help me to sort this out please? Many thanks.