Thank you, @raamardhani7! The output of commands look fine with one exception. There is a permissions issue, which most probably has nothing to do with your problem, but it's a good idea to fix it. Make sure the ownership/permissions of "
/usr/local/nagiosxi/html/config.inc.php" is set to nagios.nagios/750.
Having said that, we haven't been able to recreate the issue in-house. As suggested by npovolenko, opening a support ticket would be the next logical step in the troubleshooting process. I needed, a remote session will be scheduled. You can open a new support ticket by accessing the URL below:
https://support.nagios.com/tickets
entering a search term, clicking "Continue", then scrolling to the bottom of the page, and clicking on "Create Support Ticket".