Solution: Make sure you are running the latest version of Adobe Flash Player in your browser. You can download the latest version of the Adobe Flash Player cross-platform browser plug-in here. Once installed, restart your browser and check to see if the problem is resolved.

Did this fix your problem, or did you find another solution? If so leave us a comment.

In my case the post was triggering a SQL Injection attack warning so Mod Security was 404 redirecting the request. Mod Security was concerned because my post contained the word “select” followed by the word “from”. It did not seem to care that these words were 2 paragraphs apart?

How to Fix This Problem?

I am sure that there are many ways to fix this problem. ModSecurity is installed for a reason, and does offer some benefits so anything you can do to selectively fix problems you are having with ModSecurity is better than completely deactivating it. In my case I was able to see that the filter triggering the problem had an ID of 300016. I was able to tell ModSecurity to “skip/remove” this filter by adding the following to the virtual host block in my apache configuration file:

<Location "/wp-admin/" >
SecRuleRemoveById 300016
</Location>

Notice that I only removed this rule from requests in the /wp-admin/ directory. In theory ModSecurity should still utilize this rule to detect SQL Injection attacks in other directories. If you don’t have access to http.conf you can also use .htaccess directives to control ModSecurity from within .htaccess files. It’s probably best to contact your host to see if they are using ModSecurity and to see what they suggest.