Still having the 404 error on both DS415+ and DS212+. Support is helping, but no result after two software updates and several tips. I am still confident it will be solved, but it takes some time.
I saw the previous post and changed apache webserver to ngnix, and yes indeed this works! It is the top setting from web sattion screen in configuration.
I've tested the other web sites on my synology and all seems to work. At least this should help the support team to find a solution.
