First the two Gmail accounts I had in Thunderbird logged me out and asked to relogin.

Then Google said my accounts did NOT exist which made me feel very uneasy. Banned? Lost all my data? OMG.

Then I got error "502 That's all we know" after entering my passwords.

Finally I realized it couldn't be just me, so I opened HN and confirmed my suspicions.

It's all up and running now but I was really scared.

I'm really curious what happened because it surely looks like Google has a single point of failure in their authentication mechanism which is just horribly wrong. The company has over two billion users - a situation/configuration like this just shouldn't be even theoretically possible.