[wp-trac] [WordPress Trac] #30067: cookie error for multisite login

[WordPress Trac]

#30067: cookie error for multisite login
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 Reporter:  tezza71                 |       Owner:
     Type:  defect (bug)            |      Status:  new
 Priority:  normal                  |   Milestone:  Awaiting Review
Component:  Login and Registration  |     Version:  4.0
 Severity:  normal                  |  Resolution:
 Keywords:                          |     Focuses:
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Comment (by SergeyBiryukov):

 Does the error message mentions unexpected output? There are two typical
 reasons for that:

 1. One of the active plugins (or the theme's `functions.php` file)
 produces unexpected output, causing a "headers already sent" warning and
 consequently preventing WordPress from setting the test cookie.
 2. [https://en.wikipedia.org/wiki/Byte_order_mark UTF-8 byte order mark]
 in `wp-config.php` (or theme's `functions.php` file) has the same effect
 as above.

 You should be able to find out the culprit by looking into server error
 logs.

 Previously: #27974, #28490.

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Ticket URL: <https://core.trac.wordpress.org/ticket/30067#comment:1>
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