Here’s a clear, explanatory text for — suitable for a help guide, error message, or network status note.

Manually telling your router where to send Hamachi traffic is the most effective fix.

Hamachi relayed tunnels have various real-world applications:

Sometimes, you can't fix it. If you are on a university campus, a corporate network, or a public Wi-Fi hotspot, the network administrators have likely blocked the ports necessary for P2P (Peer-to-Peer) tunneling. In these cases, the relayed tunnel is actually a safety net—it's the only reason you have a connection at all.