The data graphs in PRTG are empty or have gaps. They show strange values. What can I do?
No or unexpected data displayed in PRTG live graphs. What can I do?
Modified on 2025-06-10 14:19:10 +0200
Disclaimer:
The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.
The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.
This article applies to PRTG Network Monitor 12 or later
Graphs in PRTG
The normal Data view of PRTG offers up to four different graphs which can be displayed simultaneously. By default, these are
If monitoring data is available for the defined timespan each graph will display the respective data. However, in the event that a sensor’s live graph is not displaying any data, while all other graphs are, there are a couple of methods of solving this issue.
If All Sensor Graphs are Affected
Perform a cache recalculation. This will delete and re-calculate the graph cache used for the display in the web interface and the Enterprise Console.
For detailed instructions, please see: My PRTG has stopped graphing
If Individual Graphs are Affected
If you see unexpected high or incredibly low values in your graphs this may be the result of wrong data reported by your devices. A spike filter can remove these false peaks.
For detailed instructions, please see: Why do I see huge peaks or spikes in graphs for SNMP sensors?
Other
If none of these procedures provides a solution please check your PRTG log files for any error messages, such as read / write errors or sensor counter changes which could account for the problem.
May, 2013 - Permalink