wp-config.php is a very important file and was created when you installed your WordPress website. It is the go between from your website to the server. It logs into the server and communicates with it. This will most certainly crash your website if you change anything in here that WordPress does not like. Like its name suggests, config – configuration. So do not play around with this file. If you have to make any changes, do so when you are sure that what you are doing has been tested. As always, make a backup copy of this file before you make any changes. This is another file that you should keep a working copy of, on your local computer.
Keep looking in the “Site Security” category for more post on how to further lock down your site against malicious bots and hackers.
As with every change you make to any file in your WordPress site, make a backup of the original file first, save a local copy, then log out of the admin back end, and log back in again to make sure everything works. Now go to your website front end to make sure that you and the rest of the web can get to your website.