Title: Undefined array key “HTTP_HOST”
Last modified: February 12, 2025

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# Undefined array key “HTTP_HOST”

 *  Resolved [jonrc](https://wordpress.org/support/users/jonrc/)
 * (@jonrc)
 * [1 year, 3 months ago](https://wordpress.org/support/topic/undefined-array-key-http_host-5/)
 * Hello,
 * When I review my error logs, I keep seeing:
 * PHP Warning: Undefined array key “HTTP_HOST” in /home/rctcorg/public_html/wp-
   content/plugins/ithemes-security-pro/core/modules/ssl/class-itsec-ssl.php on 
   line 81
 * It populates frequently and it’s usually the only error in my log. Any idea why
   this would be?

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

 *  Plugin Support [kmarusek](https://wordpress.org/support/users/kmarusek/)
 * (@kmarusek)
 * [1 year, 3 months ago](https://wordpress.org/support/topic/undefined-array-key-http_host-5/#post-18320730)
 * Hey there, 
   I understand you’re getting a PHP warning on your site with Solid
   Security Pro.This has been reported in the past and was resolved once the user
   uninstalled and reinstalled Solid Security Pro on their website.
 * When you uninstall and delete Solid Security Pro from the WP Plugins page, it
   runs a cleanup script and removes itself from the site, including the database.
   Anything left over is temporary data (transients/cron jobs) that WordPress stores.
   
   <span style=”box-sizing: border-box; margin: 0px; padding: 0px;”>Once deleted,
   please clear all caches in this manner: **server cache -> CDN cache (if you use
   it) -> plugin cache -> browser cache** before installing a fresh copy of the 
   latest plugin version, which you can grab from your [SolidWP Member Panel.](http://my.solidwp.com)
   </span>I recommend **backing up** your site before you make any changes.Please
   let me know if uninstalling and re-installing Solid Security Pro helped or if
   you have other questions.
 * Best regards,
   Kevin**SolidWP Support **
 *  [nlpro](https://wordpress.org/support/users/nlpro/)
 * (@nlpro)
 * [1 year, 2 months ago](https://wordpress.org/support/topic/undefined-array-key-http_host-5/#post-18389148)
 * Hi [@jonrc](https://wordpress.org/support/users/jonrc/),
 * According to the Solid Security 9.3.7 Changelog:
 * > Bug Fix: PHP warning when HTTP_HOST not set.
 * +++ To prevent any confusion, I’m not SolidWP +++
 *  Plugin Support [chandelierrr](https://wordpress.org/support/users/shanedelierrr/)
 * (@shanedelierrr)
 * [1 year, 1 month ago](https://wordpress.org/support/topic/undefined-array-key-http_host-5/#post-18417174)
 * Hello,
 * We hope the previous information was helpful. Tracking notifications on this 
   forum can become tricky over time, and since we haven’t received a response, 
   I’ll mark this post resolved.
   If you still require further assistance, feel free
   to open a new support topic, and we’d be happy to assist.Thank you!

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

The topic ‘Undefined array key “HTTP_HOST”’ is closed to new replies.

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 * [Kadence Security – Password, Two Factor Authentication, and Brute Force Protection](https://wordpress.org/plugins/better-wp-security/)
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 * 3 replies
 * 4 participants
 * Last reply from: [chandelierrr](https://wordpress.org/support/users/shanedelierrr/)
 * Last activity: [1 year, 1 month ago](https://wordpress.org/support/topic/undefined-array-key-http_host-5/#post-18417174)
 * Status: resolved