The Cacti Manual
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# Chapter 21. Debugging

Cacti users sometimes complain about NaN's in their graphs. Unfortunately, there are several reasons for this result. The following is a step-by-step procedure recommended for debugging.

# Check Cacti Log File

Please have a look at your cacti log file. Usually, you'll find it at `<path_cacti>/log/cacti.log`. Else see `Settings`, `Paths`. Check for this kind of error:

    CACTID: Host[...] DS[....] WARNING: SNMP timeout detected [500 ms], ignoring host '........'

For "reasonable" timeouts, this may be related to a snmpbulkwalk issue. To change this, see `Settings`, `Poller` and lower the value for `The Maximum SNMP OID's Per SNMP Get Request`. Start at a value of 1 and increase it again, if the poller starts working. Some agent's don't have the horsepower to deliver that many OID's at a time. Therefore, we can reduce the number for those older/underpowered devices.

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