The last time I saw this error, it was related to the security software or network of the host machine (your PC) blocking the connection;
Maybe someone else has another idea for a solution because I can only suggest doubling checking your security. Maybe even try a VPN to narrow it down, just in case.
Edit: Yesterday, there was a timeframe where people had login issues, because server had a hiccup - Maybe it was related to that and now it works again, hopefully?
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