system
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The dcom exploit is an attempt to access your computer from outside.
This usually indicates hijacker interference.
The Avast Network Shield is working here and thus you get the warning message.
Repeated attempts by the url address in the message should be reported to your ISP.
It is “Upgrading” in that you now have an excellent protection against hijackers. You can’t fix something if you don’t know it’s broke!
;D