Page not found (404 Error) even if the page exists?

Question

So I created a page called test.mydomain.com/hello and when I try to access it, it gives me a 404 error. I tried switching my permalink structure to default and back to post name to see if this was the error, but it's not. In the page editor, I can see that it's the good permalink and when I click on view page, it still gives me a 404 error. Also my htacess is just the default htaccess:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPresss

Any ideas arre greatly appreciated!!

Answer 1

Change your current permalink structure to the WordPress Default Permalink structure and then again change it back to your current permalink structure. Hope it will work!

If not then clear your browser cache and use Wp Super Cache plugin to clear WordPress Cache. and then open the URL test.mydomain.com/wordpress/hello/

Answer 2

I was modifying the main query in pre_get_posts...