I had a similar issue. The Editor answered “Updating failed” In the Console there was this error-message: “Failed to load resource: the server responed with a status of 405 (Method Not Allowed)”.
I was running the site local on my Computer with IIS. So this solution is for windows computers. (It’s a german interface, I will try to translate the names)
The solution for me was:
- Open IIS
- Go to Handler Mappings (Handlerzuordnung)
- Search PHP (maybe there are diffrent Mappings for your PHP)
- Click on Edit
- Click on Restrictions (Einschr?nkungen…)
- Go to Inherit (Vererben)
- Select inherhit all (Alle Vererben)
- Restart your IIS