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From chris derham <>
Subject Re: Tomcat access log reveals hack attempt: "HEAD /manager/html HTTP/1.0" 404
Date Tue, 16 Apr 2013 16:57:55 GMT
> Or, another way of looking at this would be that for every 40 servers
> scanned without a 404 delay, the same bot infrastructure within the same
> time would only be able to scan 1 server if a 1 s 404 delay was implemented
> by 50% of the webservers.

This assumes that the scanning software makes sequential requests.
Assuming your suggestion was rolled out (which I think is a good idea
in principal), wouldn't the scanners be updated to make concurrent
async requests? At which point, you only end up adding 1 second to the
total original time? Which kind of defeats it.

Again I'd like to state that I think you are onto a good idea, but the
other important point is that some (most?) of these scans are run from
botnets. These have zero cost (well for the bot farmers anyway). My
point is even if the proposal worked, they don't care if their herd is
held up a little longer - they are abusing other people
computers/connections so it doesn't cost them anything directly.

Sorry but those are my thoughts


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