Howto: Troubleshooting the device setup when using SNMP
Howto: Troubleshooting the device setup when using SNMP
If you are using a SNMP Sensor the SNMP protocol (Simple Network Management Protocol) must be installed and enabled on your device.
Please go through the following checklist:
· Is SNMP installed and enabled on the device? (see configuration of the device)
· Does your machine running PRTG Traffic Grapher have access to the SNMP connection on that device? (see device's security settings)
· Double check the "SNMP Community String" (this value is case sensitive)
· Check the SNMP Port (usually it is 161)
· Firewall issues: If the device and the monitoring machine are on two different sides of a firewall make sure that UDP access to port 161 (SNMP) is allowed and you will also need the return path open. SNMP uses UDP not TCP, so SNMP requires the use of UDP ports >1023 to the PRTG client side so that the results can be sent back from the device to the machine running PRTG.
If you have verified the issues above also check the SNMP Tweaks in the Extras|Options dialog.