Title: Cannot send session cookie/cache/header in session_start().
Last modified: August 30, 2016

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# Cannot send session cookie/cache/header in session_start().

 *  [WPAdminJoe](https://wordpress.org/support/users/wpadminjoe/)
 * (@wpadminjoe)
 * [10 years, 10 months ago](https://wordpress.org/support/topic/cannot-send-session-cookiecacheheader-in-session_start-1/)
 * Hello,
 * This post is the continuation of a post which I initially opened 2 weeks ago 
   on the Evolve Theme forum. I know, oops! This involves a core WordPress module.
   The previous post can be found [ here.](https://wordpress.org/support/topic/cannot-send-session-cookiecacheheader-in-session_start?replies=6#post-7233239)
 * The problem occurs performing a PHP Include from a WordPress page to an external
   php page. Within that external page, I set a Session and validate the users WP
   credentials. The page errors out with”
    ** ‘Cannot send session cookie/cache/
   header’, (output started at /home/wordpress/wp-includes/class.wp-scripts.php:
   180) in /administration/index.php on lines 2 and 29.**
 * Further more, I cannot perform any page redirects without receiving this error.
 * I have insured that no white space exists within the 2 files modified. The only
   modules modified within WP are:
    - Functions.php in the child theme (added Admin Bar main/sub menu options)
    - wp-config.php (added a variable to the end of the file)
    - The addition of a new WP page.
 * The external standalone application being called is sound and has been used for
   several years but gets this error when called from within WordPress. I have done
   much more troubleshooting other than simply validating a potential white space
   issue in one of the modules.
 * One additional note. This implementation works on development box (Wampserver
   on Windows) but fails on production (Linux) box.
 * Any and all help would be greatly appreciated.
 * Thank you.

The topic ‘Cannot send session cookie/cache/header in session_start().’ is closed
to new replies.

## Tags

 * [cache](https://wordpress.org/support/topic-tag/cache/)
 * [cookie](https://wordpress.org/support/topic-tag/cookie/)
 * [header](https://wordpress.org/support/topic-tag/header/)
 * [session](https://wordpress.org/support/topic-tag/session/)

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 0 replies
 * 1 participant
 * Last reply from: [WPAdminJoe](https://wordpress.org/support/users/wpadminjoe/)
 * Last activity: [10 years, 10 months ago](https://wordpress.org/support/topic/cannot-send-session-cookiecacheheader-in-session_start-1/)
 * Status: not resolved

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