Well, that may be a matter of the upgrade having wiped out settings identifying and handling your network. So, you need to tell the system, if prompted, what network it is... your work network, trusted, untrusted, etc.
Where does it say 'Public unidentified network' ?
Are you connected to that network? or is connection refused?
What security software do you have on your PC, specifically what firewall? your Action Center should tell.
I cannot call you, so I have Opted Out, and I'm sorry... I cannot continue with this case in any case, it is 11 p.m. in my time zone, and I require sleep.
I'm sorry we didn't make further progress on this. I have Opted Out, opening the case to other Experts in this category. Thanks.