Nagios Support Forum

can somebody explain the error below? manually checking on ntp is ok but is encountering error when installing nagios log server. install log below:

Nagios Log Server Installation
==============================
DATE: Fri Jan 20 07:43:38 CET 2017

DISTRO INFO:
RedHatEnterpriseServer
6.8
x86_64

Running 'setup_local_syslog'...
setup_local_syslog step already completed - skipping
Running 'prereqs'...
Loaded plugins: product-id, rhnplugin, search-disabled-repos, security,
: subscription-manager
This system is receiving updates from RHN Classic or RHN Satellite.
Setting up Install Process
Package byacc-1.9.20070509-7.el6.x86_64 already installed and latest version
Package cairo-devel-1.8.8-6.el6_6.x86_64 already installed and latest version
Package gcc-4.4.7-17.el6.x86_64 already installed and latest version
Package glib2-devel-2.28.8-5.el6.x86_64 already installed and latest version
Package glibc-2.12-1.192.el6.x86_64 already installed and latest version
Package 1:java-1.7.0-openjdk-1.7.0.121-2.6.8.1.el6_8.x86_64 already installed and latest version
Package libxml2-devel-2.7.6-21.el6_8.1.x86_64 already installed and latest version
Package 1:make-3.81-23.el6.x86_64 already installed and latest version
Package 1:net-snmp-5.5-57.el6_8.1.x86_64 already installed and latest version
Package 1:net-snmp-utils-5.5-57.el6_8.1.x86_64 already installed and latest version
Package ntp-4.2.6p5-10.el6.1.x86_64 already installed and latest version
Package openssl-1.0.1e-48.el6_8.3.x86_64 already installed and latest version
Package patch-2.6-6.el6.x86_64 already installed and latest version
Package pango-devel-1.28.1-11.el6.x86_64 already installed and latest version
Package sendmail-8.14.4-9.el6_8.1.x86_64 already installed and latest version
Package httpd-2.2.15-56.el6_8.3.x86_64 already installed and latest version
Package php-5.3.3-48.el6_8.x86_64 already installed and latest version
Package php-cli-5.3.3-48.el6_8.x86_64 already installed and latest version
Package pyOpenSSL-0.13.1-2.el6.x86_64 already installed and latest version
Package sudo-1.8.6p3-25.el6_8.x86_64 already installed and latest version
Package sysstat-9.0.4-31.el6.x86_64 already installed and latest version
Package unzip-6.0-4.el6.x86_64 already installed and latest version
Package zip-3.0-1.el6_7.1.x86_64 already installed and latest version
Package net-tools-1.60-110.el6_2.x86_64 already installed and latest version
Package php-ldap-5.3.3-48.el6_8.x86_64 already installed and latest version
Nothing to do
20 Jan 07:43:47 ntpdate[2842]: no server suitable for synchronization found

===================
INSTALLATION ERROR!
===================
Installation step failed - exiting.
Check for error messages in the install log (install.log).

If you require assistance in resolving the issue, please include install.log
in your communications with Nagios Enterprises technical support.

The step that failed was: 'prereqs'

Can you share the output of the following command executed from the CLI of your Nagios Log Server machine:
Is this environment offline or behind a proxy? Does your organization use an internal NTP server? The ntpdate command may need to be modified.

Issue is now ok. fixed by updating the ntpdate -u pool.ntp.org.
Thanks!