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I used Firefox and might have installed uBlock. I wasn't the only one with this issue, it was a general complaint within the department.

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I have bad news for your colleagues at $previousJob.

There was likely botnet activity in the network - on the users' machines connected through the VPN - triggering anti-DDoS protections.

I’m sure it happened - I just asked because a fair percentage of the time when I get a report like that and investigate with our CDN logs it turns out that they have something like a corporate proxy or browser extension which breaks some bot heuristic looking for standard browsers.

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