My "entry" account is SO. I can easily switch to MSE, Programmers, Mathematics. But I can (edit:) no longer switch to AU. That is, the Ask Ubuntu page shows, but I am not logged in (and the system suspects me being a robot). For reproduction, I go to my profile, and select the link to my hp.

For MSE, Programmers, Mathematics I am logged in as expected (as is shown in the black-bar).

What did work was to login manually into AU as suggested by @AnnaLear. Since then, I am logged in. Will probably take some time to see if this is a permanent solution.

  • On which browser do you see this? Can you repro this in another browser or in incognito mode?
    – rene
    Commented Aug 9, 2015 at 17:22
  • @rene: ff 39.0.3. In incognito-mode I am not myself, but an anonymous user.
    – false
    Commented Aug 9, 2015 at 17:23
  • @rene - I am experiencing this same issue in chrome.
    – Dzyann
    Commented Oct 28, 2015 at 23:59
  • @Dzyann but after you're logged in on AU, you stay logged in, right?
    – rene
    Commented Oct 29, 2015 at 8:29

1 Answer 1


Have you tried logging in on AU?

The other sites you listed are on the same second-level domain, so that login session is covered by the same cookie. Under some circumstances (e.g. 3rd party cookies are disabled), we may be unable to log you into all second-level domains we control.

  • I'm seeing this as well and I don't think I have 3rd party cookies disabled.
    – ChrisF Mod
    Commented Aug 9, 2015 at 23:18
  • 1
    @ChrisF In what browser? What happens if you do log in on AU or another SLD you're currently "anonymous" on?
    – Adam Lear StaffMod
    Commented Aug 9, 2015 at 23:20
  • Chrome. It works - I get logged in and I stay logged in. It was just the first time it didn't automatically log me in. On all other sites I'm auto-logged-in.
    – ChrisF Mod
    Commented Aug 9, 2015 at 23:22
  • 1
    @ChrisF If you have a moment to spare... can you log out (or switch to incognito), then log in on AU and check other domains (SO, SE, SU, etc.)? Do you get logged in on all?
    – Adam Lear StaffMod
    Commented Aug 9, 2015 at 23:24
  • Went incognito. Logged into AU. Went to accounts (was logged in on SE), went to SO profile was logged in.
    – ChrisF Mod
    Commented Aug 9, 2015 at 23:27
  • Actually I should have said I saw this, as of course it's all working OK for me now. Sorry for possibly sending you down a blind alley.
    – ChrisF Mod
    Commented Aug 9, 2015 at 23:28
  • Until recently, that is a week or so ago, it worked.
    – false
    Commented Aug 10, 2015 at 7:43
  • 1
    @false I'm gonna need more information here. Were you logged in on AU a week ago and got randomly logged out? What happens if you log in on AU again?
    – Adam Lear StaffMod
    Commented Aug 10, 2015 at 14:21
  • I was never randomly logged out. But as of yesterday, I was not able to "log in" implicitly coming from SO. Now with an explicit login, everything is fine, but I thought the new improvements should have made this seamless. At least they do this for all the other sites I tried.
    – false
    Commented Aug 10, 2015 at 14:27
  • 1
    @false You never implicitly log in by coming from SO. You implicitly login by logging in on another domain in our network. I'll check the traffic logs and see if there's anything enlightening in there, but if you are able to log in and stay logged in, I'm inclined to chalk up this case to a fluke.
    – Adam Lear StaffMod
    Commented Aug 10, 2015 at 14:38
  • If I am logged in to Stack Overflow and go a different second-level domain like Superuser or AskUbuntu, the login page offers the option to log in with Google, Facebook, or Launchpad, --or-- email/password. Entering the SO email/password logs me in to AU (and creates AU cookies), but the login page makes it appear as if the email/password is to create a new account (where users would want to enter a NEW password, not reuse one from SO). Changing the login page to have an explicit "SO" option as with Google/FB would make it more obvious that the user is linking to an existing account.
    – Dave
    Commented Apr 3, 2016 at 3:13

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