Can not open a website from within LAN, or 'not secure' shows when visiting

Can not open a website from within LAN, or 'not secure' shows when visiting

Symptom: Can not open a website from within LAN, or 'not secure' shows when visiting, but opening the website fine off LAN. 

Solution: Off LAN, ping the website address, get an IP.

Substitute the IP on LAN DNS server.

Right-click the server name under 'DNS'. Click 'Clear cache'. 

On your workstation on LAN, run 'ipconfig /flushdns'.

You will be able to open the website within LAN.