Based on the responses in several threads here, I downloaded and installed the PTFWinCertExpiration custom sensor. From Command line, it works PERFECT, returning the right number of days, however when I pass the parameters to the sensor in the web-interface, it fails. (I've copy and pasted, and manually typed both, to check for any accidental garbling)
I do notice that the only Primary Channels I see as options are Downtime and Execution Time, Value, as noted in the documentation, is not a choice.
Am I missing anything obvious? :(
For the record, this is for a code signing certificate, not a web cert, if that matters.