SCCM reporting for systems not updating

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Hi All,

 

I have a report I'm looking into and I'm trying to see if I can understand it correctly. The report has come from SCCM and I am trying to match the summary numbers I've been given related to online systems. I am looking at the columns Last Software Update Scan and Last Active and I'm trying to see if I understand what they mean. I assume that the Last Active is the last time the client contacted SCCM, but I am not sure what the Last Software Update Scan means.

 

The reason I am asking is because I have a report with some systems showing a last software update scan from July but a last contact date from September. So I am trying to understand if this is a problem or not. I know in WSUS you can have a last contact date of today for example, but the system is not getting updates.