Title: Warning: Cannot modify header
Last modified: August 19, 2016

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# Warning: Cannot modify header

 *  [nordicweb](https://wordpress.org/support/users/nordicweb/)
 * (@nordicweb)
 * [18 years ago](https://wordpress.org/support/topic/warning-cannot-modify-header-1/)
 * What is causing this? How do I fix it?
 * Warning: Cannot modify header information – headers already sent by (output started
   at …etc/wp/wp-config.php:1) in …etc/wp/wp/wp-admin/install.php on line 17
 * from: wp/wp-admin/install.php
    Thank you Nordicweb.

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

 *  Thread Starter [nordicweb](https://wordpress.org/support/users/nordicweb/)
 * (@nordicweb)
 * [18 years ago](https://wordpress.org/support/topic/warning-cannot-modify-header-1/#post-774035)
 * found spaces in the wp-config.php file that where not supposed to be there.
 *  [josesan77](https://wordpress.org/support/users/josesan77/)
 * (@josesan77)
 * [17 years, 6 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-1/#post-774564)
 * I can not find neither extra spaces nor linefeeds. What should I do now? Help,
   please!
 *  [Samuel B](https://wordpress.org/support/users/samboll/)
 * (@samboll)
 * [17 years, 6 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-1/#post-774565)
 * [http://codex.wordpress.org/Answers-Troubleshooting#Headers_already_sent](http://codex.wordpress.org/Answers-Troubleshooting#Headers_already_sent)

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

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

## Tags

 * [cannot modify header](https://wordpress.org/support/topic-tag/cannot-modify-header/)

 * In: [Installing WordPress](https://wordpress.org/support/forum/installation/)
 * 3 replies
 * 3 participants
 * Last reply from: [Samuel B](https://wordpress.org/support/users/samboll/)
 * Last activity: [17 years, 6 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-1/#post-774565)
 * Status: not resolved

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