SNMP Troubleshooting

SNMP Troubleshooting Tips

SNMP logs events to /var/log/messages The key to solving SNMP issues is to examine that log file.

Also check /etc/hosts.deny it could be that someone has disabled snmpd by adding an entry there. This will look similar to this:

cat /etc/hosts.deny

To see if the service is running, do one of the following two things:

service snmpd status


ps -ef | grep snmpd

Both these commands will also show you with what flags snmpd was started.

The configuration file for snmp is in /etc/snmpd/snmpd.conf and the service startup (snmpd) configuration file is in a different location depending on the distribution.

Try this on Ubuntu


or this on CentOS/Redhat


To configure snmpd, use this utility:

snmpconf -g basic_setup

PHP 7.4 / 8.0 and SNMP

To get PHP working with SNMP, you can’t rely on the built-in Ubuntu packages. You have to do this:

sudo add-apt-repository ppa:ondrej/php
sudo apt install php7.4-snmp

To see if it worked, watch the console for errors or do this:

php -m | grep snmp


Follow the tags in our knowledgebase to get more tips on working with SNMP.


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