Another Google bug. I’ve been seeing this lately. You search at Google or use a Google tool and you get the following screen:
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“Our systems have detected unusual traffic from your computer network.” When you get this screen, you can’t go further. No Google search, no Gmail, no Adwords, nothing.

This is happening at client’s site and other computers. A network administrator saw it on his computer last week and he knows there aren’t any virus, malware, rouge users, etc.

There’s nothing to do. Wait for 30 minutes or more and it starts working again.