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Many businesses subscribe to web filtering services, and depending on the configuration, access may be heavily restricted to things like major news sites, weather sites, etc. In some cases, a particular site may not be blocked, but a banner ad, embedded picture or link may be, in which case the entire page gets blocked. I run into this frequently at work, even on sites I go to numerous times each day - the site itself isn't blocked, but something triggers the web filter.
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