Resolved DirectoryIndex not working after migration

[TorbHo]

Plesk 17.8.11 Update #54
‪Ubuntu 18.04.2 LTS‬


After migrating a Plesk server to a new Plesk server, the websites with custom DirectoryIndex in htaccess do not work anymore. They show a "403 Forbidden" error.

The sites without custom DirectoryIndex work as expected.

Anything in the subscription template looks the same.

What could have caused this error and can we somehow bulk change this behavior?
It are a lot of sites, so I don't want to change them one by one.

 

[TorbHo]

Update: some mod_rewrite rules don't work anymore, too.
Could there be some kind of connection?

 

[TorbHo]

I don't know why, but after I changed settings->server settings->preferred domains for website
from "www.domain.tld" to "none" it worked

The old server was set to "www.domain.tld", too. Does this make any sense to you?