Google ads.txt 404 error

I added the ads.txt to my theme repository and uploaded + activated it as advised in some tutorials to upload this file and fix AdSense issues.
But when going to the 10da10.net/ads.txt, as it is supposed to work, my page does an error 404 instead of showing the adsense text file.
Do I need to do something else, like adding a redirect in my domain manager or something within ghost itself?
cache is already reseted, but it doesn’t work

I uploaded also the same file with an other name try 10da10.net/test.txt (it works), but 10da10.net/test.txt/ with the slash at the end doesn’t work.

really strange…