Cannot modify header information – headers already sent

  • Resolved grevillea859

    (@grevillea859)


    6 months ago

    Hello,

    I am hoping someone can assist with this problem of headers already sent in which has occurred twice.

    I have lodged a support ticket on the pro site and had some email exchanges. I am unable to export a txt file from the Diagnostics tab because it throws a 503 service unavailable error each time. I have tried emailing it from that tab but have not heard as to whether the second attempt whether it went through. Even so the problem is still occurring and I am looking for help.

    The PHP warnings are: Cannot modify header information – headers already sent in

    /home/mysite/public_html/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/waf.php on line 1195
    /plugins/wordfence/vendor/wordfence/wf-waf/src/lib/utils.php on line 749
    /plugins/wordfence/vendor/wordfence/wf-waf/src/lib/utils.php on line 750
    /plugins/wordfence/vendor/wordfence/wf-waf/src/lib/utils.php on line 751

    I checked these files for whitespace or lines but all seemed in order.
    I have not optimized the firewall. I deactivated the plugins systematically but no issues found. I ran my site on learning mode for a few days also.

    I am on a shared server. Is there anything on the server side which could impact this behaviour given the 503? Or can these warnings be ignored?

    I have no idea what to do next and suggestions would be greatly appreciated. Thank you for your time.

    The page I need help with: [log in to see the link]

Viewing 1 replies (of 1 total)
  • Plugin Support wfpeter

    (@wfpeter)

    Hi @grevillea859, thank-you for getting in touch.

    If I’ve not misunderstood, you have a Premium license for Wordfence and have already contacted support in the past? If so, please reach back out to the Customer Support engineer assisting you there or open a new support ticket on https://support.wordfence.com as we can only support the Free version of the plugin here on the forums.

    I can mention that when I’ve personally seen the “…headers already sent” message in the past, it’s been linked to another plugin (or custom code) loading WordPress core files out of order. That’s a possibility here if that’s not been mentioned to you already.

    Many thanks,
    Peter.

Viewing 1 replies (of 1 total)
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