ERROR: cannot verify assets.nagios.com’s certificate, issued

[Nags007]

Hi Team,
I am trying to install Nagios XI on RHEL 6.8 ( Santiago ). I am facing below error, when i run the ./fullinstall as root.

ERROR: cannot verify assets.nagios.com’s certificate, issued by

Latest update message for the ./fullinstall
======================================
ERROR: cannot verify assets.nagios.com’s certificate, issued by
Unable to locally verify the issuer’s authority.

ERROR: Subcomponent 'wkhtmlx' installation failed - exiting.
Subcomponents installation failed - exiting

=====================================================================
[nagiosxi]# grep proxy /etc/wgetrc
#https_proxy = http://proxy.yoyodyne.com:18023/
#http_proxy = http://proxy.yoyodyne.com:18023/
#ftp_proxy = http://proxy.yoyodyne.com:18023/
# If you do not want to use proxy at all, set this to off.
#use_proxy = on
[root@nagiosxi]# grep proxy /etc/yum.conf
[root@nagiosxi]#

Please help on this ?

Thank you,
Nag

[dwhitfield]

locking, as a duplicate of https://support.nagios.com/forum/viewto ... 999#bottom