Following the results of the above-linked Internet Connectivity Evaluation Tool can be tricky. You can find online documentation for disabling RWIN auto-scaling if necessary or enabling Compound TCP if your router can accept it (either using Netsh), if those defaults should be changed. However, it can be a real mystery to make your UPnP router work. It could be the Microsoft has another confusing and hard to-remember name for the technology: Internet Gateway Device Discovery and Control (IGDDC). To take advantage of IGDDC, you must have:
- A UPnP-compatible router with UPnP enabled
- Network Discovery turned On (be on a "Private" network)
- Internet Connection Sharing turned On for the Wireless Network Connection
- UPnP Device Host service set to Automatic (Delayed) (this is the default)