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As a PRTG user, I want PRTG to detect when Netflow packets contain start/stop time information that is likely wrong, and to display a warning.
Details of user story
I just spent several days trying to work out why my Netflow sensor graphs weren't displaying any data. Zooming out to the 2 and 30 day views showed what appeared to be older data. I concluded it was working intermittently, but later realised new data was being added, just not at the right date/time. I then concluded that there must be some kind of time zone bug.
I eventually stumbled on the suggestion to set the flow timeout to zero to tell the sensor to ignore times when a device is sending wrong time information. Problem immediately fixed. The information is mentioned in the information button next to the Active Flow Timeout setting, but I never clicked on it before because I thought I knew all about it.
I think it should be possible for PRTG to recognise that the data is being assigned erratic/impossible times. It could then display a warning. Eg at the top of the page like it does when the time zone is wrong.
- Criterion #1 Warning pops up at top of sensor page when erratic time information detected, with suggestion to set timeout to zero.
- Criterion #2 An alternative simpler "fix" would be to display the zero timeout suggestion permanently next to the setting.