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I frequently the below message when using Google search:

Our systems have detected unusual traffic from your computer network. This page checks to see if it's really you sending the requests, and not a robot. Why did this happen?

This page appears when Google automatically detects requests coming from your computer network which appear to be in violation of the Terms of Service. The block will expire shortly after those requests stop. In the meantime, solving the above CAPTCHA will let you continue to use our services.

This traffic may have been sent by malicious software, a browser plug-in, or a script that sends automated requests. If you share your network connection, ask your administrator for help — a different computer using the same IP address may be responsible. Learn more

Sometimes you may be asked to solve the CAPTCHA if you are using advanced terms that robots are known to use, or sending requests very quickly.

Then I have to solve a captcha which I normally get incorrect and then have to solve another one. I don't have any malware or suspicious plugins. It seems to frequently happen during peak hour, both in Windows and OS X using Firefox.

I think the problem is to do with my ISP using a shared IP for all users. I have filed a support request with Google without any luck. Any other suggestions?

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Have a look at this help article from Google: [Unusual traffic from your computer network ](support.google.com/websearch/bin/…) –  user17843 Mar 4 '12 at 19:54
Google makes its living by profiling us - and our searches. I got the "Our systems have detected unusual traffic from your computer network" message using Linux, with no trujans, virii and my own server - but using Opera Browser with a somewhat personalised search script. There was no unusual traffic. However, Google likes to return search results consistent with my own purchasing habits. It was unable to profile me, so asked me to prove I am indeed a person. Google's claims that there are viruses involved would indeed be responsible had there been "unusual traffic." However, try setting up –  user18016 Mar 10 '12 at 22:08
However, try setting up some unusual traffic of your own (connection keepers, whatever) and Google will never see any of it. Only you and your ISP will. –  user18016 Mar 10 '12 at 22:08
@user18016 comment directed me into the fact that the queries coming from Opera 17 (default install) from the URL bar are classified as "unusual". It seems that turning instant search off fixed this. –  jakub.g Nov 11 '13 at 13:58

1 Answer 1

There can be other reasons besides malware or trojans on your computer. If your computer is a part of an intranet/ protected network, all requests originating from within the intranet (via proxy) would appear to Google as coming from the same IP address. As a result, it would give the message for unusual amount of traffic.

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Yes that is pretty must my suspicion stated in my question. Any solution to this problem? –  row1 Oct 31 '12 at 7:42
nope... i better delete this as an answer and put it as a comment –  Anurag Oct 31 '12 at 7:46

protected by Community Jul 27 '12 at 12:24

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