There aren’t a lot of conditions that you (as a visitor) need to meet in order to be allowed access to most websites.
In most cases, this particular error is encountered because the website administrator is using some kind of security application that actively blocks your IP range. This is most commonly done with Incapsula or a similar service.
As some users have confirmed, this particular issue can also occur if you’re using an overprotective AV or firewall solution. Most of these 3-rd party security suites are now featuring a self-maintained list of blacklisted websites. But as you can imagine, some are more accurate than others.
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