YoastSEO Sitemap XML 404 Not Found
By Michael Lavrik on February 25th, 2016
You just installed the very popular YoastSEO plugin. When clicking the on the sitemap XML link you discover a 404 error on the page that takes you to www.yourdomain.com/sitemap_index.xml
Before you dig too deeply into the issue and start to modify .htaccess or any code. Try to disable the XML plugin and then re-enable. Most of the time it will fix the problem on a new install.