I've made sure that each PC are set as Private.
I've checked the firewall setting on the Primary making sure that Multiplicity is allowed. There are six listings for Multiplicity (MP Application clipboard, MP Application Remote Screen, MP Audio Service, MP Clipboard, MP Remote Screen Service and MP Service. All six are enabled and allowed in the Inbound Rules panel.
Also ran the portFix script on both computers.
Also read again, the Connection 101 section of MP support FAQ.
Still can not ping the secondary. Multiplicity still does not work.