I thought I'd pass this on. One of the earlier messages in this thread gave me a tip on where to look.
My problem was not quite the same, but had a similar effect. I had a W8.1 laptop networked to several other machines (W7 and XPs). I moved it to another network (for business reasons) for several days and when I tried to come back to the original workgroup,
I found no settings changed BUT I couldn't connect to the other computers. "Entire Network" was not available, and the machine couldn't find the workgroup. All of the other computers could connect to each other, of course, but not to the 8.1 machine.
So I checked Windows Firewall and it was turned off (I use Comodo, which I had also turned off). But I went into the "Advanced Security" setting and found ALL the settings in the Group "Network Discovery" NOT "enabled". So I enabled all of them, and voila!
- my network came back. And all this with Windows Firewall TURNED OFF!
I've attached a screenshot to show what all these settings are. I did disable the UPnP-In rules that were not private, and I'm wondering about some of the other "public" rules, and whether or not they should be enabled. But I'll go with this for now, and I'm
going to keep looking to see if I can get everything back again. At least I can communicate with the other computers on the network now.
Just changing the "Inbound Rules" worked for me, but I changed the appropriate "Outbound Rules" for good measure.
I still haven't figured out how to get my "Entire Network" and workgroup icons back in the Network window yet.
