Windows – Why does Windows Firewall want to block Google Chrome today

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I've been using the same public Wi-Fi (staying in a guesthouse) for over a week now.

But this morning for the first time I got this puzzling warning from Windows Firewall:

Windows Firewall has blocked some features of Google Chrome on all public and private networks

Why does Windows Firewall want to block one of the world's most popular web browsers today after being fine with it for years, and being fine with it on this connection for a week?

Could it hinge on the words, some features? If so could it be something like a rare or new feature of Chrome that uses a different HTTP port? And if so why doesn't the security alert tell me any more about it?

Or could it be a known bug in Windows Firewall?
Or perhaps a known virus etc attaching itself to Google Chrome?
Or is there a chance it's related to "Other browser makers follow Google's lead, revoke rogue certificates"?

I haven't restarted Chrome for days and have downloaded but not installed a Windows update from a few days ago. So I'm not sure what may have managed to change on my machine since yesterday.

Best Answer

Google Chrome updates itself without asking you first (Firefox does the same - nothing sinister, just makes sure you always have the latest security patches), and this is separate from Windows Update. Since you're on public wifi, Windows Firewall is stricter about changes to network-accessing software than it would be on a network you marked as private.

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