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I log into Stack Exchange sites using my Google details. For the last few days I can't log in to the main Stack Overflow. As you can see I'm successfully able to log in to Meta, and I can log in to all the other sites I've tried (Server fault, Photography).

But on the main Stack Overflow, if I click "log in" I'm redirected to the main page but still not logged in.

For info I've watched the process in Firebug; everything looks reasonable, it does a POST to

which results in the following response:

{"Message":"Welcome back <a href=\"/users/382166/asc99c\">asc99c</a>, you've been logged in."}

But I haven't!

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Have you tried logging in with a new profile? See here for how to start the profile manager. – Stijn Sep 27 '13 at 13:58
Just tried resetting Firefox (never seen that feature before!) but I still can't log in – asc99c Sep 27 '13 at 14:01
It is definitely in that area though, I can log in with Chrome just fine. – asc99c Sep 27 '13 at 14:07

I just had this exact same issue 2 years after you. I think the cookies get corrupted.

I solved it by deleting my cookies for all Stack Exchange sites.

In Chrome:

  1. Go to your Settings
  2. Click Show advanced settings...
  3. Under the Privacy header, click the Content Settings... button
  4. Under the Cookies header, click the All cookies and site data... button
  5. Filter (Search) with the word stack
  6. For every site that has # cookies, click the delete X on the right side
    • You can ignore the ones that only say Local Storage
  7. Go to your Stack Exchange site and login! :)
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