To fix DC++ connection issues, you must configure your active mode settings, open your router ports, or allow the app through your firewall.
DC++ relies heavily on direct connections between users. If your network blocks these connections, you will experience search timeouts, download failures, or an inability to connect to hubs. 1. Fix “No Slots Available” or Search Timeouts
This is usually caused by running in Passive Mode instead of Active Mode. Passive users cannot download from other passive users. Open Settings > Connection settings.
Change your connection mode from Passive to Active (Direct Connection) or Firewall with UPnP.
If you use UPnP, check the Let DC++ determine the best connectivity settings box. 2. Configure Manual Port Forwarding
If UPnP fails, you must forward ports manually in your router settings to stay in Active Mode.
Assign Ports: In DC++, set TCP, UDP, and TLS to specific port numbers (e.g., 1412).
Find IP: Open Command Prompt, type ipconfig, and note your IPv4 Address.
Router Setup: Log into your router and forward your chosen ports (e.g., 1412) to your computer’s IPv4 Address.
Update DC++: Enter your external/public IP address in the External / WAN IP field in DC++. 3. Check Windows Firewall and Antivirus
Security software frequently blocks the inbound connections that DC++ requires.
Open Windows Defender Firewall > Allow an app or feature through Windows Defender Firewall. Click Change settings and locate DC++ in the list. Check both Private and Public boxes.
If you use third-party antivirus software, add the DC++ executable as an exception. 4. Resolve “TLS Connection Failed”
Many modern hubs require secure TLS connections, which can fail due to outdated security certificates. Ensure you are running the latest version of DC++. Go to Settings > Connection settings > TLS settings.
Verify that your certificates are properly generated (DC++ can auto-generate these on startup). 5. Fix “Hub Disconnected” or Connection Timeouts
If you cannot connect to the hub itself, the issue is likely the hub address or your internet protocol.
Verify URL: Ensure the hub address is spelled correctly and still active.
Protocol Conflict: Some hubs only support IPv4. If you have an IPv6-only network, go to Settings > Advanced and adjust the IPv6 settings or use a dual-stack configuration. If you want to get this sorted out quickly, tell me: What exact error message are you seeing? Are you currently set to Active or Passive mode? What operating system are you running?
I can give you the exact step-by-step instructions for your specific setup.
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