Title: Site Lock Errors
Last modified: March 22, 2023

---

# Site Lock Errors

 *  [mmununison](https://wordpress.org/support/users/mmununison/)
 * (@mmununison)
 * [3 years, 3 months ago](https://wordpress.org/support/topic/site-lock-errors/)
 * We’ve installed the sitelock on our website and connected it to our hosting server.
 * When we activate the sitelock plug-in, it’s causing so many error messages and
   it’s just not working. I’ve reached out to the theme developer and he said it’s
   the error from the plug-in so I was told to contact the plug-in developer.
 * So we had to deactivate the plug-in even though we are paying for the service.
   Please see the error messages.
 * Notice: Undefined index: SITELOCK_IP_HEADER in /home3/unisona1/public_html/wp-
   content/plugins/sitelock/sitelock.php on line 38
 * Warning: Cannot modify header information – headers already sent by (output started
   at /home3/unisona1/public_html/wp-content/plugins/sitelock/sitelock.php:38) in/
   home3/unisona1/public_html/wp-admin/includes/misc.php on line 1416
 * Warning: Cannot modify header information – headers already sent by (output started
   at /home3/unisona1/public_html/wp-content/plugins/sitelock/sitelock.php:38) in/
   home3/unisona1/public_html/wp-includes/functions.php on line 6865
 * Warning: Cannot modify header information – headers already sent by (output started
   at /home3/unisona1/public_html/wp-content/plugins/sitelock/sitelock.php:38) in/
   home3/unisona1/public_html/wp-admin/admin-header.php on line 9
 * **Notice**: Undefined index: SITELOCK_IP_HEADER in**/home3/unisona1/public_html/
   wp-content/plugins/sitelock/sitelock.php**on line**38**
 * Please help!
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fsite-lock-errors%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

The topic ‘Site Lock Errors’ is closed to new replies.

 * ![](https://ps.w.org/sitelock/assets/icon.svg?rev=3500997)
 * [SiteLock Security – WP Hardening, Login Security & Malware Scans](https://wordpress.org/plugins/sitelock/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/sitelock/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/sitelock/)
 * [Active Topics](https://wordpress.org/support/plugin/sitelock/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/sitelock/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/sitelock/reviews/)

 * 0 replies
 * 1 participant
 * Last reply from: [mmununison](https://wordpress.org/support/users/mmununison/)
 * Last activity: [3 years, 3 months ago](https://wordpress.org/support/topic/site-lock-errors/)
 * Status: not resolved