Why does it show that there is no permission to access?

Question

The following is the question

Forbidden

You don't have permission to access / on this server.

Answer 1

1. The accessed document has insufficient permissions. Requires permissions above 755. Solution: Use the command chmod 755 /var/www/ or other corresponding directories.
2. Reasons for SELinux or firewall. Solution: First turn off SELinux and let the firewall pass the WWW service.
3. Virtual host configuration error. For example, I encountered this once: