This problem is occurring because the required sudoers entries are missing.
The following steps shows you how to get the correct sudoers entries from the XI installation file. It is not possible to provide all the entries in this KB article as they may change in newer versions of XI. These steps ensure you get the correct entries for your version of Nagios XI.
First you must download the XI installation file to your Nagios XI server. You'll do this with the WGET command. Please refer to the following link to get the correct download link for your version of Nagios XI:
Download Page - Nagios XI Versions
Open an ssh session to your Nagios XI host.
Execute the following commands (use your XI version download link in the wget command):
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cd /tmp
wget https://assets.nagios.com/downloads/nagiosxi/5/xi-5.6.3.tar.gzOnce downloaded you'll need to use the name of the downloaded file in the next command, in this example xi-5.6.3.tar.gz is the name being used:
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tar xzf xi-5.6.3.tar.gz nagiosxi/nagiosxi/nagiosxi.sudoers --strip-components 2Run all these commands to fix your /etc/sudoers file to make sure it has all the correct entries:
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grep -v NAGIOSXI /etc/sudoers > /etc/sudoers.new
mv -f /etc/sudoers.new /etc/sudoers
rm -rf /etc/sudoers.d/nagiosxi
sed -i 's/^Defaults requiretty/#Defaults requiretty/g' /etc/sudoers
cat /tmp/nagiosxi.sudoers >> /etc/sudoers
chmod 440 /etc/sudoers