Your mileage may vary, but this is what I found worked for me:
Control Panel\Network and Internet\Network and Sharing Center\Advanced sharing settings
Disable the 128-bit protocol and allow 56 and 40 bit encryption.
I also opened-up pretty much everything I could think of on my computer (public shares, making this computer searchable, etc. etc.)
Oddly, I have xfinity xfi, and it said something about a security threat to my unraid server on their internet.xfinity.com website, but I have to wonder how that's even a thing as I'm behind a NAT