Classic Themes: Portfolio Posts Navigating to Page Not Found

You sit down after just finishing up your site migration. Everything looks good! Then you get around to testing your menu… pages, posts, custom post types all return: 404 Page not found. This can be a very stressful moment, especially if you have not encountered this behavior before. Oftentimes, the solution to this issue is rather quick.

If your portfolio posts start linking to a 404 page not found, try re-saving your permalinks. In your WordPress Dashboard, navigate to Settings > Permalinks and Save.