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What causes a Man in the Middle attack on windows

I just had a man in the middle attack pop up and I shut down my network temporary and will change my password later as a result. I was looking in my history to see if I could find the exact cause because this is the second time i've had this happen. Is it possible that Firefox is causing Norton to think a man in the middle attack is happening? Can bad internet also do this? None of my other devices detect this. I also have parents in my house that understand very little of these types of things and think everything will be ok (hints why I have to change my password later). Really I just want to know if Norton has a way of telling what caused it? There's not a lot of information available for me to go on besides documentation on what it is. I want to know if it's a false positive or not.

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Re: What causes a Man in the Middle attack on windows

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Re: What causes a Man in the Middle attack on windows

FWIW ~ 
Keep your home Wi-Fi safe in 7 simple steps
https://us.norton.com/internetsecurity-iot-keep-your-home-wifi-safe.html 

Message: "Unsecure Wi-Fi Detected"
Your Norton device security product now has a new feature to inform you if your WiFi network is secured. Whenever your device connects to a Wi-Fi network, your Norton product automatically checks for the encryption level used by the Wi-Fi network, and notifies you if it is unsecure.

https://support.norton.com/sp/en/us/home/current/solutions/v119368797

Message: "Wi-Fi network is Compromised: Data you send and receive is exposed to third party on this network…"
When your device connects to any Wi-Fi network, the Wi-Fi Security feature scans the Wi-Fi network for vulnerabilities and alerts you if it is not safe.

Depending on the Wi-Fi network that your device is connected to, select one of the following:

  • I am unsure of the safety of the Wi-Fi network ›
  • I trust the Wi-Fi network that Norton incorrectly detects as compromised ›

https://support.norton.com/sp/en/us/home/current/solutions/v126815646

Message: "Wi-Fi network is Compromised: Your personal data and communications are exposed to an attacker on this network…"
When your device connects to any Wi-Fi network, the Wi-Fi Security feature in Norton 360 for iOS scans the Wi-Fi network for vulnerabilities and alerts you if it is not safe.

Depending on the Wi-Fi network that your device is connected to, select one of the following:

If you are unsure of the safety of the Wi-Fi network, in the compromised network alert window, do one of the following:

  • If you already have VPN included in your Norton subscription, tap Turn On VPN.

  • If VPN is not included in your subscription, tap Leave Network and connect to a different network.

https://support.norton.com/sp/en/us/home/current/solutions/v137860684 

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