Error: The file '/etc/nginx/ssl/example.pem' is mislabeled on your system

#!!!! The file '/etc/nginx/ssl/example.pem' is mislabeled on your system.

The above error was generated because the specific file type (.pem / certificate) was placed in a location that was not allowed via a SELinux module ruleset or alternatively the file permissions were incorrect.

In order to rectify the problem we should issue:

 restorecon -R -v /etc/nginx/ssl/example.pem