Ho ricevuto un’email da qualcuno che ha difficoltà ad attivare l’autenticazione a due fattori (2FA), ma non ricordo di averla mai attivata o di aver configurato nulla al riguardo. È necessario che lo faccia?
2FA was added back in early March. See Discourse 2.0.0.beta4 Release Notes. You (a Discourse site admin) shouldn’t need to do anything.
@featheredtoast may have some suggestions on what to try (or to ask the user to try) to get this working.
Thanks 
Is there anyway we can disable it? I haven’t looked into it so not sure how it works, but I don’t like the idea of having to rely on (or send user info to) a third party.
I don’t believe it can be disabled, no. Also, no data is being sent to a third party.
Here’s a quick summary of 2FA: Discourse implemented the TOTP (time-based one time password) algorithm. When a user decides to enable 2FA they are presented with a QR code (or a long string of characters). That string is used by an authentication app (like Google Authenticator, Microsoft Authenticator, Authy, YubiKey, etc.) to generate a new 6-digit password every 30 seconds. Those apps are in no way connected to your Discourse site, nor do they have any user info. They simply generate a code every 30 seconds. Your Discourse site also knows what those codes are, so when a user tries to log in, after entering their username and password they’re asked for a code. They check their app, enter the code, and the server checks if it’s the same code it expected.
Does that make sense?
A good thing to check is whether or not the server time is in sync with the world (generally through ntp).
Having an incorrect time can cause some interesting errors as this protocol is time based.
Thanks both
Does it need to connect to a third party to learn/check what those codes are? Or is it all generated on my server?
Just checked the time and it’s fine… would timezones matter? I’m guessing the person is in a different timezone to that of what is set for the server.
Ask the user to use the “Time correction for codes” operation in the app’s settings.
Not at all - it is 100% on the server.
No. It’s based off UTC; not local time.
What may help is if you want to check what the server’s opinion of the current code is you can use e.g. from the rails console:
pry(main)> User.find_by(username: "Supermathie").totp.now
=> "319971"
Ehi, è possibile che un amministratore disattivi l’autenticazione a due fattori di qualcuno?
Non sembra esserci un’opzione per farlo, ma uno dei membri della nostra community è bloccato fuori e non riesce ad accedere perché ha attivato l’2FA.
Non è possibile disattivare l’autenticazione a due fattori (2FA) dall’interfaccia utente: per farlo è necessario accedere alla console Rails. Vedi How to disable 2FA - #11 by featheredtoast
Un piccolo aggiornamento su questo: gli amministratori ora possono disabilitare il 2FA per altri utenti dalla pagina /admin/users di ciascun utente. 