Title: Cannot modify header information
Last modified: June 27, 2017

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# Cannot modify header information

 *  Resolved [acommarata](https://wordpress.org/support/users/acommarata/)
 * (@acommarata)
 * [8 years, 10 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-134/)
 * We started receiving the following error/warning message:
 * Warning: Cannot modify header information – headers already sent by (output started
   at /home/ecoterra/public_html/wp-check.php:32) in /home/ecoterra/public_html/
   wp-content/plugins/security-malware-firewall/security-malware-firewall.php on
   line 154
    -  This topic was modified 8 years, 10 months ago by [acommarata](https://wordpress.org/support/users/acommarata/).

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Plugin Support [amagsumov](https://wordpress.org/support/users/amagsumov/)
 * (@amagsumov)
 * [8 years, 10 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-134/#post-9265413)
 * Hello.
 * Thank you for your request.
 * We will revise the code of the plugin and try to fix it as fast as possible. 
   It may take 1-2 days.
 * Sorry for the inconveniences. Please, wait.
 * Your CleanTalk Control Panel: [ [https://cleantalk.org/my/](https://cleantalk.org/my/)].
 * Best regards.
 *  [Safronik](https://wordpress.org/support/users/safronik/)
 * (@safronik)
 * [8 years, 10 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-134/#post-9268519)
 * Hello acommarata,
 * Some file called wp-check.php laying in the root folder started to output something
   before we set a cookies.
 * I think that there are some spaces or a new line symbols. We recommend to edit
   this file and clean it from such errors.
    The responsible plugin is NinjaFirewall(
   WP Edition). We have reported about the error on their support forum. ([https://wordpress.org/support/topic/warning-cannot-modify-header-information-181/](https://wordpress.org/support/topic/warning-cannot-modify-header-information-181/))
 * We could fix it but you should give us an access to your FTP. If you choose this
   variant, please, create a private ticket here: [https://cleantalk.org/my/support/open](https://cleantalk.org/my/support/open)
 * Please, contact us.
 *  [Safronik](https://wordpress.org/support/users/safronik/)
 * (@safronik)
 * [8 years, 10 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-134/#post-9274310)
 * Hello,
 * Please, read the answer from the developers of the NinjaFirewall plugin. [https://wordpress.org/support/topic/warning-cannot-modify-header-information-181/](https://wordpress.org/support/topic/warning-cannot-modify-header-information-181/)
   
   They tell that this is normal situation. May be some one of the plugins outputs
   something before it should.
 * Unfortunately we can’t do nothing about. Some other plugin cause it.
    Our suggestion
   about manually fix via FTP is still actual.
 * Please, contact us or mark the topic as resolved.

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘Cannot modify header information’ is closed to new replies.

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 * 3 replies
 * 3 participants
 * Last reply from: [Safronik](https://wordpress.org/support/users/safronik/)
 * Last activity: [8 years, 10 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-134/#post-9274310)
 * Status: resolved