Host cannot access Web sites in a Linux virtual machine

Problem phenomenon:

1. Nginx Service is started
2. 80-port is monitored by nginx
3. Hosts and Linux virtual machines can ping each other
4. Linux virtual machine can access Web sites with Curl
5. The host cannot access the Web site with a browser

Investigation:
1. View Nginx Access.log found no request to come in
It can be judged that the firewall is blocking it.

2. Check the iptables status and discover that iptables is not booting (actually not installed)
3. After Baidu found that CentOS default with firewall as a firewall is not iptables, so with
   Systemctl Stop Firewalld.service
   Stop the firewall
4. Re-visit website, success!

Host cannot access Web sites in a Linux virtual machine