Additionally, a 403 Forbidden error was encountered while trying to use an Error

your file ownership and/or permissions are incorrect.

1) What user is PHP running under? If you’re using PHP-FM,

ps -ef |grep php

if apache, ps -ef |grep apache or ps -ef |grep httpd

2) where is wordpress installed?

ls -l /path/to/wordpress

who owns those files and where are the directory and file permissions

3) How do you know this is a mod_security issue? What makes you suspect that?

4) What operating system are you using?

2) nothing, nothing changed.

Except it stopped working, so something changed. If you changed nothing in the site configuration, please contact your host to see if they changed anything. (Beware of hosts being “helpful” 🙂 )

Because the traffic was a lot

I think you might want to reconsider and go to a managed WordPress solution like that provided by Dreampress (Dreamhost), WP-engine, or one of the other quality WP hosters. They run the server, you worry about content. In your current postion, you’re driving the car you don’t know how to drive while typing in your content. A crash is inevitable.