ERROR: Cookies are blocked due to unexpected output.

  • I have a WordPress website that I recently discovered had this error on the login page.

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

    I can only access the login page from wp-login.php – /wp-admin/ display a blank white page.

    I’ve searched the web and tried many things with no success. I’ve tried:

    • removing ?> and space at end of the functions.php
    • ensuring both functions.php and wp-config had no spaces at beginning or end of file
    • opening wp-config.php and functions.php in notepad++ and converting to UTF-8 (people recommend ‘without BOM’ but that is only an option in the newest version of notepad++ – I’m guessing UTF-8 does that now)
    • I’ve set WP_DEBUG to true and have received not errors in debug.log – except for 2 that relate to when I hadn’t fully uploaded some files. that particular error mentioned nav-menu.php – This confirmed that it is reporting errors, just not related to my login issues
    • I renamed each plugin folder with _tmp at the end to try and rule out any plugins causing the problem
    • I also renamed the plugins folder to rule out all plugins at the same time

    Given these things I’ve tried – and that I’m not receiving any PHP errors – what else could I try?

Viewing 2 replies - 1 through 2 (of 2 total)

  • THANK YOU! I know many people are encountering this issue. I’ve been trying to troubleshoot it for a couple days and thought I had tried everything, until I read your list. Mine turned out to be one space at the beginning of the wp-config file. I hadn’t seen that yet. How infuriating… I sincerely hope you figure yours out.

    The only thing I tried that wasn’t on your list was adding

    <IfModule mod_security.c>
 SecFilterEngine On
 SecFilterScanPOST On
</IfModule>

    to the .htaccess… Good luck.

    Thread Starter stemlund

    (@stemlund)

    I have discovered that I’m having the same exact issue almost exactly a year later. I had forgot what I actually did to fix it the first time. Then finally remembered. Just in case this will help others. I simply delete the existing wp-admin and wp-includes directories for my WordPress install and replace them with fresh files from the most recent WordPress downloaded from www.remarpro.com.

    This seems to fix the issue, without trying to track down the exact file that needs fixed in those folders.

Viewing 2 replies - 1 through 2 (of 2 total)
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