1. Write down the ports actually in use
Open eMule's connection preferences and note the selected TCP and UDP ports. Keep the program running while you test it. Instructions for a different installation may show different numbers, so treat those as examples rather than values to copy blindly.
Also note whether the issue is eD2K Low ID, Kad firewalled, or both. eD2K reachability and Kad status are related checks, but a good result for one does not establish that the other is working.
2. Check the Windows firewall rule
Make sure the rule applies to the eMule executable you are actually running. A replacement installation or a different folder can leave a rule pointing at an old file. Check the network profile used by your current connection and allow the application on the networks you intend to use.
Keep the firewall enabled. A specific application or port rule gives you a useful test without exposing unrelated applications.
3. Follow the router mapping to the right computer
A manual forwarding rule needs the right protocol, external port, internal port and destination device. If your computer receives a different local address, the rule can silently point elsewhere. A DHCP reservation can keep that destination consistent.
If you use UPnP, inspect whether the requested mappings exist. Avoid maintaining conflicting UPnP and manual rules for the same port while troubleshooting. Pick one approach and verify its result.
4. Look for a second layer of routing
A broadband modem, a separate Wi-Fi router and a mesh system can create more than one translation layer. A rule on the inner router alone may not be enough. Your Internet provider may also use carrier-grade NAT, in which case an ordinary rule on your home router cannot make the provider's shared address accept an inbound connection.
If the router's Internet address is not a public address assigned to you, ask the provider what incoming-connection options are available. A VPN connection introduces its own routing and forwarding requirements; it is not automatically a fix.
5. Retest, then check the result in eMule
After one change, run the client's port test and reconnect as needed. Record what changed and whether TCP and UDP results improved. If the result is still unclear, test with the simplest intended network path rather than adding more tools at once.
High ID improves reachability. It does not create a missing source, remove every queue or guarantee the maximum speed of your broadband line. If reachability is working but a transfer remains slow, continue with the download-speed checklist.