How to Troubleshoot and Fix Connection Errors in AirDC++ AirDC++ is a powerful client for the Direct Connect network, but connection errors can completely halt your file-sharing experience. Whether you cannot connect to a specific hub or your search results are coming up blank, connection issues usually stem from misconfigured network settings, firewall blocks, or incorrect security certificates.
This guide breaks down the most common AirDC++ connection errors and provides step-by-step solutions to get you back online. 1. Diagnose Your Connection Mode (Active vs. Passive)
AirDC++ operates in two primary modes: Active and Passive. If your connection mode is misconfigured, you will experience severe connection drops, or you will be unable to download from a large portion of users.
Active Mode: Requires open ports. It allows you to connect to all users (both Active and Passive). This is the ideal setup.
Passive Mode: Used when ports cannot be opened. You can only connect to Active users, severely limiting your download pool. How to Fix: Open AirDC++ and navigate to Settings > Connectivity. Select Manual configuration.
If your router supports UPnP (Universal Plug and Play), check the box for Let AirDC++ configure my router automatically (UPnP). This automatically opens the required ports.
If UPnP fails, select Direct connection (Active mode) and manually assign TCP, UDP, and TLS ports (e.g., 14122). You must then log into your router’s admin panel and forward these specific ports to your computer’s local IP address.
As a temporary troubleshooting step, select Passive mode to see if your connection returns. If it works, your issue is definitely related to blocked ports. 2. Fix “TLS Handshake Failed” and Certificate Errors
Direct Connect hubs frequently utilize TLS encryption to secure communications. If you encounter errors like TLS handshake failed or Certificate rejected, AirDC++ is blocking the connection due to a security mismatch. How to Fix: Go to Settings > Connectivity > Encryption. Locate the setting for TLS trust level.
If you trust the hub but it uses a self-signed certificate, change the level to Accept all certificates or Strict (allow self-signed).
Alternatively, you can clear old, cached certificates. Go to your AirDC++ app data folder (usually C:\Users\YourUsername\AppData\Roaming\AirDC++) and locate the Certificates folder. Delete the conflicting certificate file for that specific hub, then restart the client to generate a new one. 3. Configure Windows Defender and Third-Party Firewalls
Because AirDC++ relies heavily on inbound and outbound traffic across multiple ports, aggressive firewall settings will frequently block its traffic, resulting in timeout errors. How to Fix:
Open the Windows Start menu, type Windows Defender Firewall, and select it.
Click Allow an app or feature through Windows Defender Firewall on the left panel. Click Change settings (requires administrator privileges).
Scroll down to find AirDC++. Ensure both the Private and Public checkboxes are ticked.
If AirDC++ is not on the list, click Allow another app…, browse to your AirDC++ installation folder, select the .exe file, and add it.
If you use a third-party antivirus (like Avast, Kaspersky, or Bitdefender), open its firewall module and add AirDC++ to the “Exclusions” or “Trusted Applications” list. 4. Update the Hub Addresses (Public Hub Lists)
If you are getting a Connection refused or Host not found error immediately upon starting the software, the public hub list URL you are using might be offline or outdated. How to Fix:
Open the Public Hubs window in AirDC++ (usually a magnifying glass icon or via the View menu). Look at the drop-down menu for the hub list URL.
If the list fails to load, replace it with a reliably maintained public address. Popular, current alternatives include:
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