I usually log in on https://stackoverflow.com, after I do a full browser reset or cookie cleaning.

After this, I noticed I am not automatically logged in on https://stackexchange.com. So I usually log in a second time on https://stackexchange.com.

But then, for other sites:

  • meta.SE
  • SuperUser
  • AskUbuntu
  • ServerFault
  • etc.

I have to re-log-in on each of them!

There is no option like "Log in with your already-logged-in SE account":

enter image description here

As far as I remember, in the past, I used to log in on SO only, and then I was automatically in on the other websites.

How to enable this again?

It's very unconvenient to have to enter the username/password for every website.

Note : third party cookies are disabled in my browser Chrome. But I whitelisted these:

enter image description here

and the problem is still there.


enter image description here

  • 2
    Do you allow third party cookies in your browser? If not, allow/whitelist the SE domains. – rene Nov 17 '20 at 13:32
  • Does this answer your question? Is it possible to sign in to all Stack Exchange sites without cookies? – Luuklag Nov 17 '20 at 13:35
  • 2
    @Luuklag No, I don't delete cookies on every browser exit. It's a different issue. – Basj Nov 17 '20 at 13:39
  • 2
    @rene True, I disallowed third party cookies in Chrome! That might be the reason. How to whitelist them? Should I whitelist also all domain specific websites: superuser.com, serverfault.com, etc. If so, would be interesting to have a detailed answer. – Basj Nov 17 '20 at 13:40
  • @rene I tried with "block third party cookies" still enabled, but whitelist (including 3rd party cookies) for stackexchange.com, serverfault.com. But still when arriving on serverfault.com I am logged out... – Basj Nov 17 '20 at 13:43
  • Did you re-authenticate once? – rene Nov 17 '20 at 13:44
  • @rene Please look at the edited question, I added a screenshot at the end. – Basj Nov 17 '20 at 13:44
  • Also see: meta.stackexchange.com/questions/56161/… – Luuklag Nov 17 '20 at 13:45
  • @rene Yes, I just did. I cleaned all cookies, and re-authentificated once again on SE.com Then going on serverfault.com shows the same problem. – Basj Nov 17 '20 at 13:46
  • Hmm, strange. Based on the details in my answer here: meta.stackexchange.com/a/312956/158100 I would expect that now to work. – rene Nov 17 '20 at 13:47
  • Can you also whitelist [*.]stackauth.com? – rene Nov 17 '20 at 13:51
  • If you clean cookies and then re-authenticate please use stackoverflow.com and then visit serverfault.com. StackExchange.com is a bit weird and might not cooperate as you would expect. – rene Nov 17 '20 at 13:53
  • I retried all of this: i.stack.imgur.com/DgtB0.png (see edited question), but it still fails. Should [*.] be included in the pattern? – Basj Nov 17 '20 at 13:55
  • @Basj Hmm, maybe that pattern is not correct in hindsight. If you open a dev console, can you see the calls being made to the other domains and are there cookies returned in their response headers? – rene Nov 17 '20 at 14:02

You may need to allow all cross-site cookies and third-party cookies. I have also tried setting the tracking prevention (in Edge/Firefox/Chrome) to balanced and disabled any blocking extensions. It should work after a browser reload (that is, closing the browser and then opening it again with the same windows.)

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