No access to media folder

To be completed by the original poster:

CMS Version

3.1.4

Installation Method

Custom install

Operating System

Debian Linux

Issue

Can’t upload any media. Error message: Forbidden
And also can’t access stored media, which comes with the CMS installation.
I checked the rights of the folder and set them to:
drwxrwxr-x /signage/web
drwxrwxr-x /signage/web/library

Any help very appreciated.

Many thanks

Christian