Overview This KB article provides solutions to issues that can arise when uploading SNMP MIB files.     Permissions Some problems are caused by incorrect permissions on the SNMP MIB files. If you receive one of these errors: failed to convert to... Read More

Problem Description When starting or restarting the snmptt service you see output that looks like the following: Starting snmptt: add_mibdir: strings scanned in from /usr/share/snmp/mibs/.index are too large. count = 49 Cannot find module (SNMPv2-TC... Read More

Problem Description After following the documentation to Integrate SNMP Traps with Nagios XI (https://support.nagios.com/kb/article.php?id=232) there are five EVENTs defined in the /etc/snmp/snmptt.conf file. These five entries have uncommented EXEC... Read More

Firewall Rules These steps explain how to check if the Operating System (OS) of the Nagios server has firewall rules enabled to allow inbound SNMP Trap UDP port 162 traffic. The different supported OS's have different firewall commands which are... Read More

Overview This article shows you several methods of sending a trap to your Nagios server to test SNMP Trap functionality. Sometimes when troubleshooting an SNMP Trap issue, it can be very helpful to remove the actual device that could be causing... Read More

Inbound TCP Traffic These steps explain how to confirm that the Nagios server is receiving SNMP Trap traffic destined for it on the UDP port 162. In this example, the following applies: Remote computer sending SNMP Traps 10.25.5.20 Nagios server... Read More

snmptrapd Service The snmptrapd service is what receives an SNMP Trap from the networking stack and then places it into a spool directory for the snmptt service to process. These steps help confirm that the snmptrapd service is working correctly.... Read More

snmptt Service The snmptt service is what processes traps that have been placed into the spool directory by the snmptrapd service. "Processing Traps" means to look at the spooled trap and determine if it needs to be submitted to Nagios and how.... Read More