Network File Sharing Access problem -- AGAIN!

THE SCENARIO We've had a home LAN among three family members since I returned to California 25 years ago. At some point, I replaced a Windows Home Server installation with Windows Server 2012 Essentials. I maintained this for my brother and elderly Moms until they died between 2022 and 2023. I had to recycle their computers, and re-evaluated my "digital fortress". I insisted on keeping two client systems -- twins essentially -- as recommended by another friend on the East Coast and former neighbor. A third system -- using the same processor and chipset as the other two -- was deployed as a "Media PC" feeding my Sony Bravia and AVR, and it was also a backup file server. I would synch important personal business files regularly with this third system. I also have a laptop, and I use it the same way. When I updated two of these systems (including the Media box) to Windows 11, it was a provisional upgrade, since the processors just precede Coffee Lake -- the first of... Read more