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When connecting email accounts to Thunderbird, I've checked remember this password option.
But after a few weeks of password reentering-free life, it asks for the passwords yet again, out of the blue.

Is this sort of expiration a normal thing and can I safely re-enter the passwords?
Or perhaps it is some form of Man-in-the-middle attack?

The accounts I've been asked to re-authenticate to are Gmail.
Other work just fine.

I'm using Ubuntu-ish OS, haven't changed a thing, haven't moved to a different location (IP change), haven't even unplugged my setup. The only change is installing updates on a daily basis.

migrated from security.stackexchange.com Jul 9 '17 at 15:27

This question came from our site for information security professionals.

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    Potentially relevant after Googling "Thunderbird gmail remember this password": support.mozilla.org/en-US/questions/1086835 – schroeder Jul 7 '17 at 14:57
  • So, yes, MitM: but it's Gmail – schroeder Jul 7 '17 at 14:57
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    Thanks for the link. The clue is "The token will expire at some point, so you'll have to renew it in the future.". If I got it right, that is the reference confirming this, along with expiration cause: "The user account has exceeded a certain number of token requests." – vucalur Jul 9 '17 at 11:04
  • Do you want to convert it to an answer somehow, or should I do that? – vucalur Jul 9 '17 at 11:07
  • If that's the case, this is actually off-topic here. I'll migrate to SuperUser and you should answer yourself. – schroeder Jul 9 '17 at 15:27

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