Cornerstone iFrame Response Error

[cfckiley]

Hello,
The cornerstone preview will not load because of an ‘iframe response error’. Plugins are up to date.

[Prasant]

Hello @cfckiley,

Thanks for asking.

Please do the following general solutions because it needs to be done by you.

1. Please make sure that you are running PHP 7 or later on the server as running old version of PHP can have potential issues. You can refer following document for server requirement https://wordpress.org/about/requirements/1

2. Ensure everything is up to date according to our version compatibility list at https://theme.co/apex/forum/t/troubleshooting-version-compatibility/195. Please follow the best practices when updating your theme and plugins. See https://theme.co/apex/forum/t/setup-updating-your-themes-and-plugins/62 for more details.

3. Test for a plugin conflict. You can do this by deactivating all third party plugins, and seeing if the problem remains. If it’s fixed, you’ll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.

4. Remove custom CSS, Javascript and templates.

5. Reset your htaccess file by renaming it to .htaccess-bak. Then in WP Admin Menu, go to Settings > Permalinks and just click the Save Changes button.

6. Contact your host to increase your allocated memory or do it yourself by adding this code in your wp-config.php

define( 'WP_MEMORY_LIMIT', '256M' );
define( 'WP_MAX_MEMORY_LIMIT', '512M' );

If nothing helps, please give us WP Admin and FTP access in a Secure Note.

Thanks.

[cfckiley]

Our developer setup Wordpress to prevent automatic updates (to reduce the possibility of our website breaking with each update). We are currently running Wordpress 4.6.1 and PHP 5.6.33.
Cornerstone just quit working two days ago. Would this be the problem?
I’ve tried deactivating all plugins and the issue didn’t resolve.

[christopher]

Hi there,

I checked your website and it seems that there is a limitation regarding the iFrame which throws the error below:

I am not sure how this is imposed, I suggest that you contact your hosting service provider and ask them to exclude the Cornerstone URLs from their mod_security rules.

Also, the best way to know if this is a hosting issue is to move your website to your local machine or another test server and test the case. If it is working there then it should be something related to the hosting service provider.

Unfortunately, the site seems to be live and I could not test for the plugin conflict as I will not remember what was on and what off. So I will accept the fact that you already tested that yourself.

Thank you.