Hello webfeet, Thank you for contacting us about issues with .htaccess RewriteRules resulting in a 404 error. If you are you using a CMS such as WordPress, Joomla, Drupal, etc. I recommend using a plugin or addon instead. This is to avoid interfering with existing rules, or rules that are added by your CMS via the "Dashboard" or Admin section. We are happy to help you troubleshoot the issue, but will need some additional information. Do you get the 404 error only when you add this rule? What address/URL are you trying to redirect from? What address/URL do you want to redirect to? Let us know if you have any further questions. Thank you, John-Paul