Starting httpd: httpd: Could not reliably determine the server's fully qualified domain name, using 2

Virtualmin
1

after enabling and now disabled , ProxyWebite setting Apache Webserver stopped working , now not starting kindly help ,

recently i just enabled and disabled proxywebsite setting ,

error message is :

Failed to start service :

Starting httpd: httpd: Could not reliably determine the server’s fully qualified domain name, using 2a01:4f8:140:4404::2 for ServerName
[FAILED]

2

Running these commands give below result :

hostname:

CentOS-66-64-minimal

hostname -f

CentOS-66-64-minimal

cat /etc/hosts:

nameserver config

IPv4

127.0.0.1 localhost.localdomain localhost
78.47.238.34 CentOS-66-64-minimal

IPv6

::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
2a01:4f8:140:4404::2 CentOS-66-64-minimal

netstat -tpln | grep :80