Title: Switch from Windows to Linux, Cannot Modify Header errors
Last modified: August 20, 2016

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# Switch from Windows to Linux, Cannot Modify Header errors

 *  [browneandrae](https://wordpress.org/support/users/browneandrae/)
 * (@browneandrae)
 * [14 years ago](https://wordpress.org/support/topic/switch-from-windows-to-linux-cannot-modify-header-errors/)
 * Yesterday we made a switch from Windows to Linux through GoDaddy and I believe
   that error messages appearing on the sites wp-login.php are associated with it.
   There are four lines:
 * Warning: Cannot modify header information – headers already sent by (output started
   at /home/content/88/9177388/html/datacentersummiteast-rtp/wp-content/themes/news/
   functions.php:1) in /home/content/88/9177388/html/datacentersummiteast-rtp/wp-
   login.php on line 349
 * Warning: Cannot modify header information – headers already sent by (output started
   at /home/content/88/9177388/html/datacentersummiteast-rtp/wp-content/themes/news/
   functions.php:1) in /home/content/88/9177388/html/datacentersummiteast-rtp/wp-
   login.php on line 361
 * Warning: Unknown: open(/var/chroot/home/content/88/9177388/tmp/sess_vuf6qluitcpmoih5g7c1qgihj3,
   O_RDWR) failed: No such file or directory (2) in Unknown on line 0
 * Warning: Unknown: Failed to write session data (files). Please verify that the
   current setting of session.save_path is correct () in Unknown on line 0
 * I know that it might have something to do with PHP not being able to write to
   the /tmp directory or a missing/tmp directory. I am not sure how to fix the lines
   in the wp-login and function php files and I am not sure about any other way 
   to resolve the issue.

Viewing 1 replies (of 1 total)

 *  [esmi](https://wordpress.org/support/users/esmi/)
 * (@esmi)
 * [14 years ago](https://wordpress.org/support/topic/switch-from-windows-to-linux-cannot-modify-header-errors/#post-2797779)
 * [Solving “headers already sent” warnings](http://codex.wordpress.org/FAQ_Troubleshooting#How_do_I_solve_the_Headers_already_sent_warning_problem.3F)

Viewing 1 replies (of 1 total)

The topic ‘Switch from Windows to Linux, Cannot Modify Header errors’ is closed 
to new replies.

## Tags

 * [Cannot modify header information](https://wordpress.org/support/topic-tag/cannot-modify-header-information/)
 * [php](https://wordpress.org/support/topic-tag/php/)
 * [wp-login.php](https://wordpress.org/support/topic-tag/wp-login-php/)

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 1 reply
 * 2 participants
 * Last reply from: [esmi](https://wordpress.org/support/users/esmi/)
 * Last activity: [14 years ago](https://wordpress.org/support/topic/switch-from-windows-to-linux-cannot-modify-header-errors/#post-2797779)
 * Status: not resolved

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