[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:  major                   |  Resolution:
 Keywords:                          |     Focuses:
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Comment (by SergeyBiryukov):

 > output started at ../wp/wp-content/themes/medica-
 child/theme_config/widgets/TF_Widget_Contact.php:1

 The number after the colon is a line number where the unexpected output
 occurs. Line number 1 usually means the file is saved with UTF-8 byte
 order mark, which should be removed.

 See
 [http://codex.wordpress.org/FAQ_Troubleshooting#How_do_I_solve_the_Headers_already_sent_warning_problem.3F
 "How do I solve the Headers already sent warning problem?"] on Codex.

 Aside from blocking cookies, unexpected output also breaks AJAX requests
 in the admin, making it impossible to view files from Media Library in the
 "Add Media" modal, etc.

 This looks more like a support issue to me, I don't think we can do
 anything here from the core perspective. Provide better docs maybe?

 Related: #15710, #17197.

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Ticket URL: <https://core.trac.wordpress.org/ticket/27974#comment:5>
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