Missing ifont images

Hello,
I have installed icingaweb2 on the new server and I cant display ifont icons. All the rights to files are exactly the same as on the previous server.

Icinga Web 2 Version
2.8.2
Git commit
8a89839af94a247ee2149b2336c73b8251b477c0
PHP Version
7.1.30
Git commit date
2020-08-17

missing_ifont_icons

Icinga is installing ifonts with the package, so I guess that the problem won’t be not installed fonts. Do you know, where should I find the cause of the problem?

Lukas

It is solved. We had enabled content-security-policy. Content-Security-Policy - HTTP | MDN
So I have added exception for npro fonts.

The complete rule inside apache config looks like this:
Header always set Content-Security-Policy “default-src ‘self’ https://www.myserver.cz; script-src ‘unsafe-eval’ ‘unsafe-inline’ https://www.myserver.cz; style-src ‘unsafe-inline’ https://www.myserver.cz; font-src ‘self’ data: https://www.myserver.cz