I use Wordpress Multisite.
I am trying to insert an image to a page, but as soon as I click update it gives me an Error 406 or 404 on my page depending on Theme. If I only post texts the page displays properly just without a picture.
Works fine with only text. I have tried to insert with sql and it works too, but it doesn't work with wordpress editor.
I fix it! In my host, have enable "modsecurity", when enable, any url by other domain are blocked, disable modsecurity and be happy