Support » Networking WordPress » Multisite Log In Problem with Cookies Error

Viewing 6 replies - 1 through 6 (of 6 total)
  • Experiencing the same problem since upgrade to 3.9. I can log into root site and first 2 subdomains but after that get the Cookie blocked error and 3 header errors (…/pluggable.php on line 861)

    No solution found so far.

    Moderator Ipstenu (Mika Epstein)


    🏳️‍🌈 Plugin Review Team Rep

    So there was actually a fix but it seems not to work.

    Both of you should try manually reinstalling the WP core files

    Also try turning on WP_DEBUG (it’s in your wp-config.php file) and see if that gets a better error.

    Thanks Mika. Tried all of the suggestions in the link you sent and finally found 1 that worked. Adding the following to wp-config.php allowed me to login into the remaining multisite subdomains:

    define(‘COOKIE_DOMAIN’, false);

    Not sure of the ramifications of leaving this in place so plan to comment it out when done configuring the sites. I’ve verified that once removed wp-admin will again be broken so this bug actually serves as a security measure should the pwd get compromised.

    Moderator Ipstenu (Mika Epstein)


    🏳️‍🌈 Plugin Review Team Rep

    It’s fine if you leave that in. It means your server isn’t really setting cookies right for some reason, which is PROBABLY a plugin issue.


    Just ran into this issue as well and it turns out that the problem is that it’s not recognizing the mapping of the alternative domains (in your case: and to the primary

    So it’s trying to send a cookie with the primary domain even though you are browsing Cross domain cookies don’t work. In other words, I can’t set a cookie for from my local website.

    So you need to go into the main network admin -> Settings (left nav) -> Domains .. and then add the domain name. If you are unsure of your “siteid”, you can find that by going into the Network Admin -> Sites and hover over the site in the list without clicking on it — you’ll see in the URL the ID # of the site. E.g. /wp-admin/network/site-info.php?id=7 — the Site ID is 7.

    Hope this makes sense and helps, I tried the COOKIE_DOMAIN in the wp-config.php and that didn’t help … this solved the problem.

    Here’s a link to an article explaining the same thing, FYI:

    Multisite: How to add new sites and map a custom domain



    Yes, I have the exact same problem using WP 4.1 Dinah: cross-domain cookies.
    Solution was the plugin and instructions on
    worked. Thanks!
    (Plugin sounds like a good candidate for core)

Viewing 6 replies - 1 through 6 (of 6 total)
  • The topic ‘Multisite Log In Problem with Cookies Error’ is closed to new replies.