External command error: Timeout: No Response from xxx.xxx.xx.xx:161

Checking for any alerts in WARNING status on our Nagios server, I have found the following errors for a couple of Linux servers :

External command error: Timeout: No Response from 192.168.81.245:161

ERROR: Interface Status Request : No response from remote host “192.168.81.245”

ERROR: Description table : No response from remote host “192.168.81.245”

ERROR: hrStorageDescr Table : No response from remote host “192.168.81.245”

ERROR: Description Table hrStorageType : No response from remote host “192.168.81.245”

ERROR: hrStorageDescr Table : No response from remote host “192.168.81.245”

In this particular configuration, Nagios server sends regularly a SNMP request to servers with a running SNMP daemon for server- health status (swap, cpuload) checks. If the SNMPD program is not started, the information requested are not reported as it should be and the error messages above are brought to the sysadmin through Nagios web interface.

In order to remove these errors, SNMP daemon must be started :

root@localhost:~#/etc/init.d/snmpd start

To check the SNMPD status :

root@localhost:~# /etc/init.d/snmpd status

The latest command should print the SNMP daemon PID.

Hope this will help you !

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