1709 broke my networking now my computers can't be accessed

I have 3 computers. On 1703 all computers talk to each other via shared folders without passwords on my private network. 1=desktop=1709=wired, 2=laptop=wireless=1709, 3=laptop=wireless=1703,
All units can access my NAS b4 and after the update.
I updated 2 from 1703 to 1709 and It broke a few things and the worst being my network.
One computer is still on 1703 and I can talk to it from either 1709 unit, but it can no longer access either 1709 unit.
Neither 1709 computer can talk to the other.
I can see the computers but if I try to access them the message is that it is not accessible
I have disabled the defender firewall. I have set the sharing and security the same as on the 1703. The network file sharing and discovery are all set properly.
WHAT am I missing???????????
The bigger question is why does MS think they have to change all this on an upgrade. I even had to recover my ownership as it assigned it to an unknown user - one of those Sxxxxxx things.

Thank you, I missed that one. But I seem to remember changing that to try to fix it.
Maybe it is a combination and it all didn't come together at the same time.

hat off!