How do I fix a broken .htaccess file that is causing my inner pages to return 404 errors?

Core server configuration file corruption breaks internal routing rules, breaking page maps and generating 404 errors across sub-urls until default clean rewrite definitions are restored.

“This tends to be a corrupted .htaccess file that’s lost its rewrite rules, breaking your inner page routing. I’ll restore clean rules and have your pages loading again within 24 hours for $99.”
— Jeff Bollettino, Managing Director, Ignite Conversions