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I just visited Ask Ubuntu (askubuntu.com) while logged into Stack Exchange, and noticed that "join this community" doesn't appear:

sign up - log in - etc

It is similarly broken on Math Overflow (mathoverflow.net). It works, however, on all sites that are subdomains of stackexchange.com, like Mathematics (math.stackexchange.com) and Academia.

I'm using Google Chrome version 46.0.2490.86 on Windows 8.1 Update 1.

(I don't know if this can actually be fixed, given how cookie security works, but I figured Stack Exchange should be aware of the issue.)

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9
  • Are you logged into another Stack Exchange account? I can't repro this (I get join this community there)
    – Zizouz212
    Commented Nov 27, 2015 at 19:53
  • I did, a long time ago, accidentally have a different account on Stack Overflow. I have never logged into it anywhere else. @Zizouz212
    – Ben N
    Commented Nov 27, 2015 at 19:55
  • Not really a bug. As Adam explains in comments to this answer, you must first have account on those sites to see "join this community" when not logged in
    – Shadow Wizard
    Commented Nov 27, 2015 at 19:58
  • Here's what I see: i.sstatic.net/G2b5Q.png Are you logged in even one SE account?
    – Zizouz212
    Commented Nov 27, 2015 at 19:59
  • @Zizouz212 I am logged in with this account. Visiting SO, SU, SF, or Area 51 shows me fully logged in. I get "join this community" on all sites (where I haven't fully registered) that are subdomains of stackexchange.com.
    – Ben N
    Commented Nov 27, 2015 at 20:00
  • But you see "log in" and "sign up" for askubuntu? Strange..
    – Zizouz212
    Commented Nov 27, 2015 at 20:00
  • 2
    @ShadowWizard No, that's old info. "join this community" is for sites you don't have an account on.
    – Adam Lear StaffMod
    Commented Nov 28, 2015 at 5:30
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    @BenN I'm retagging this as [support] (see my answer) since I'm pretty sure this is normal (albeit unintuitive) behaviour. Let me know if you're seeing something different and I'll dig in deeper.
    – Adam Lear StaffMod
    Commented Nov 28, 2015 at 5:35
  • Thanks for this question. I just ran into the same problem. Is there a list of SEs that aren't on subdomains?
    – Brondahl
    Commented Oct 26, 2019 at 7:46

3 Answers 3

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When did you log in last time? Not visited a site, but actually logged in?

We didn't have a good way to "grandfather" cross-domain sessions and link them up together, so when universal login went live, people logged in to different domains within the network potentially ended up with ungrouped sessions for each domain.

In Safari, this behaviour is unfortunately normal since Safari does not accept third-party cookies under any circumstances. In other browsers, assuming you have third-party cookies allowed (or at least white-listed the domains involved), you can "fix" this by logging in on a domain that still gives you the "sign up" and "log in" links instead of "join this community". That should link up your new session with the existing one(s) and kick off login requests for the remaining domains as well.

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    I had logged in on a different computer just a few days ago, but my last login on this machine was a good long while back. Creating an account on Ask Ubuntu the "sign in" way fixed it on Math Overflow too.
    – Ben N
    Commented Nov 28, 2015 at 16:11
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I just ran into the same issue. I was logged into https://stackoverflow.com/ but https://superuser.com wasn't showing the "Join this community" button. It seems this was because I had tracking protection turned on in my browser's settings.

I had to do the following:

  1. Turn off my browser's Tracking Protection on both domains.
  2. Log out of StackOverflow
  3. Log back into StackOverflow
  4. Refresh SuperUser
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-1

After getting a new machine and slowly attempting to log back into my accounts, I forgot how I had all of my stack exchange accounts logged in previously. Luckily, I was able to follow M - post and successfully log into my sister stack exchange accounts after StackOverflow without any problem. If you're using Firefox, you can turn off the tracking protection as mentioned here when you're on StackOverflow, and then proceed with the next steps.

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    This answer has no new info, you can add the Firefox link as comment on the other answer, or even better a suggested edit.
    – Shadow Wizard
    Commented Dec 7 at 7:15
  • @ShadowWizard Noted.
    – kyrlon
    Commented Dec 7 at 14:28

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