I just looked at some random configuration file on my system. Right at the top, in the comments was the following: # Please don't edit this file directly

I just looked at some random configuration file on my system. Right at the top, in the comments was the following: # Please don't edit this file directly (it is updated with every Red Hat # Linux update, overwriting your changes). Instead, edit /etc/... Nice. I now know to make changes in a file that won't be overwritten by an update, and if there are issues, it's either with the site local file, or the one provided by Red Hat, and it's probably (although not exclusively) the site local file that is in error.