Why does the permission denied error appear?

Question

Apache HTTP Server

I'm trying to connect ssl to apache.
But an error occurs

Permission denied: Init: Can't open server certificate file /etc/httpd/conf/ssl/server.crt

for the sake of the purity of the experiment, I set everyone full rights to this file.
checked the path, also correct. what else could be the reason?
httpd.conf

NameVirtualHost *:443

<VirtualHost *:443>
  ServerName www.onko4.local
  DocumentRoot /var/www/html
  SSLEngine on
  SSLCertificateFile /etc/httpd/conf/ssl/server.crt
  SSLCertificateKeyFile /etc/httpd/conf/ssl/server.key
</VirtualHost>

NameVirtualHost *:80
  
<VirtualHost *:80>
  ServerName Default
  DocumentRoot /var/www/html
</VirtualHost>

<VirtualHost *:80>
  ServerName www.onko4.local
        ServerAdmin [email protected]host
        DocumentRoot /var/www/html
        #ErrorLog /var/httpd/www/logs/error.log
        TransferLog logs/access.log
</VirtualHost>

<VirtualHost *:80>
        ServerName req.onko4.local
        ServerAdmin [email protected]
        DocumentRoot /var/www/html/req
        #ErrorLog /var/https/lib/logs/error.log
        TransferLog logs/access.log
</VirtualHost>

Answer 1

Disabled Selinux and everything worked

Answer 2

Log in as the problem user:
and manually check if he has read permissions:
cat /var/www/ssl/server.crt

Answer 3

Check the permissions on all directories along the path to the file.