localhost: timed out, nothing received while running ntpq -p

 I was trying to configure NTP in my Oracle Linux 7 Server. The content of /etc/ntp.conf file was

server NTP_server_1

server NTP_server_2

server NTP_server_3

server  127.127.1.0

fudge   127.127.1.0 stratum 10

driftfile /var/lib/ntp/drift

restrict default nomodify notrap nopeer noquery

Changed the firewall

[root@apps etc]# firewall-cmd --zone=public --add-service=ntp

success

[root@apps etc]# firewall-cmd --zone=public --permanent --add-service=ntp

success

[root@apps etc]# systemctl start ntpd

[root@apps etc]# systemctl enable ntpd

Now, when i tried to run ntpq -p, got the below error

Error Message:-

localhost: timed out, nothing received

***Request timed out

Solution:-

The error message indicates that the ntpq command can not access localhost.localdomain, it means the localhost can not access the local ntpq service.

The restrict option in /etc/ntp.conf allows you to control which machines can access your server.

added the below line in /etc/ntp.conf file.

[root@apps etc]# grep 127.0.0.1 /etc/ntp.conf

restrict 127.0.0.1

[root@apps etc]# service ntpd restart

Redirecting to /bin/systemctl restart ntpd.service

[root@apps etc]# ntpq -p

     remote           refid      st t when poll reach   delay   offset  jitter

==============================================================================

*LOCAL(0)        .LOCL.          10 l   12   64    1    0.000    0.000   0.000