I hear stories all the time about over aggressive web filtering all the time. Like library anti-pornography filters blocking "'breast' cancer" medical sites.
Since it was a one day thing I am assuming someone flipped on a filter that took out too much and it was noticed by the IT team or someone important complained.
Alternatively they monitor traffic and we flipped some keyword detector and then after a manual check someone approved it.
I have seen both happen in the past.
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