What This Tool Checks
The Active Mode Check tests the public TCP port that your DC++ client uses for incoming peer connections. Enter the hostname or public IP address that other users should reach, then enter the active-mode TCP port from your client settings.
Active Mode And Passive Mode
In passive mode, your client can connect out to hubs and to active users, but other passive users usually cannot connect back to you. Searches can return fewer results because many results travel through direct client-to-client paths. In active mode, your client accepts incoming TCP connections and receives UDP search replies on the configured port, so more peers can reach you directly.
What The Result Means
If the TCP port is open, the outside internet can reach your client address on that port from the hublist server. If it is closed or filtered, your router, local firewall, VPN, ISP, or client setting is probably blocking incoming connections. The UDP field is shown because DC++ active search also uses UDP, but this page cannot prove UDP without a real client reply.
Before You Test
- Set your DC++ client to active mode and note the TCP and UDP ports.
- Forward the same TCP and UDP ports in your router to the computer running the client.
- Allow the client through Windows Firewall, macOS firewall, Linux firewall, or security software.
- If you use a VPN, test the VPN-assigned port or turn the VPN off for comparison.
After The Test
When the TCP port opens, try a public hub search again and compare the number of results. If downloads still fail, test the hub protocol with Protocol Test, check the route with Traceroute, and read Active Mode Help for router examples.