[wp-trac] [WordPress Trac] #27974: Unable to Log In, Cookies Are Blocked Due To Unexpected Output

[WordPress Trac]

#27974: Unable to Log In, Cookies Are Blocked Due To Unexpected Output
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 Reporter:  dejong1968              |      Owner:
     Type:  defect (bug)            |     Status:  new
 Priority:  normal                  |  Milestone:  Awaiting Review
Component:  Login and Registration  |    Version:  3.9
 Severity:  normal                  |   Keywords:
  Focuses:                          |
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 This is a follow-up to #27373.

 Last Friday, all of a sudden I couldn't login to WP anymore.
 I was working on my site, logged out and within a few minutes
 I tried to login again. I got the message:

 ERROR: Cookies are blocked due to unexpected output. For help, please see
 this documentation or try the support forums.

 I googled the problem and found that more users are having the same
 problem:
 https://wordpress.org/support/topic/unable-to-log-in-cookies-are-blocked-
 due-to-unexpected-output?replies=3#post-5476901

 It seems to be related to a recent WP update. Up to now, there's no
 solution available. This seems like a bug to me. I read ticket #27373
 where this is discussed, though the information shows no solution.
 How can I get rid of this annoying bug so me and others can start editing
 our WP-sites again? Thanks in advance, greetings form the Netherlands.

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Ticket URL: <https://core.trac.wordpress.org/ticket/27974>
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