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Having trouble doing Trend Houscall PC Scan

I have been trying to do a PC Scan and it downloads.  Then it says it is downloading Trend Active Update.  Then I get this message:
Trend Active Update Did Not Update Successfully.  If may result from busy server or bad network traffic.
Error Code: 28
Error String: Generic Source Network Failure
Does anyone know if they are having a problem or could my firewall be blocking it.  I've been trying for several days.
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