@ThatotherGuy:
I do appreciate your reply, however I have tried unplugging cables, numerous times.
Let me guess : the device you hooked up to the LAN to visit the GUI also uses a static IP - or, using other words : you changed default network settings on that device.
In that case, ripping out the RJ45 and putting it back in won't do - neither running ipconfig /renew. You have t change your IP/DNS/Gateway manually.
Btw : an advice : when you buy a PC/Printer/whatever : Never ever deactivate the DHCP client. Leave it on. Don't touch any network settings except maybe the network group name.
You just gave one of the many reasons why …
Setup in your router (pfSense here) all IP's with their MAC addresses. All your devices will also have the IP(s you assigned on a central place.
Do not use static addresses.