I have IIAB 7.2 Installed on Linux Mint 20.2 on a DELL laptop. It is wired with Ethernet to a TP-Link Router configured as Local Access Point with DHCP Server . The router is NOT connected to the Internet. It provides the local LAN.

Wordpress and Moodle are installed on IIAB

The router provides IIAB server the IP Address 192.168.0.101.
I have another Client machine. Connected to the same router and it has the address 192.168.0.100

From this Client machine I am using Chrome as my browser.

I get the home page with 192.168.0.101/home and then clicking on Wordpress Icon the url is changed to box/wordpress and the connection fails with these errors.

Chrome gives this error.
This site can’t be reached,
box’s DNS  could not be found. Diagnosing the problem.
DNS_PROBE_STARTED
No Internet
Then
No Internet
No Internet
Try:
• Checking the network cables, modem and router
• Reconnecting to Wi-Fi
DNS_PROBE_FINISHED_NO_INTERNET

192.169.1.99/moodle turns into http://box.lan/moodle
and the error is

This site can’t be reached
Check if there is a typo in box.lan.
DNS_PROBE_FINISHED_NXDOMAIN
The following entries work
192.168.0.101/home
192.168.0.101/admin
192.168.0.101/kolibri
192.168.0.101/kiwix
192.168.0.101/usb
192.168.0.101/modules