: Right-click the person you are trying to connect to and select "Ping." If you get "Request Timed Out," the issue is likely a firewall on their end.
To understand the fix, you must understand the problem.
Enable debug logging to see why relay TCP is forced:
Provide instructions for (Netgear, TP-Link, Asus).
Open a web browser, type your router’s gateway IP address (commonly 192.168.1.1 or 192.168.0.1 ), and log in. Navigate to the , NAT , or WAN settings tab. Locate the UPnP setting and toggle it to Enabled . Save the settings and reboot your router. Step 2: Manual Port Forwarding (If UPnP Fails) radmin vpn relay tcp fix work
Click the button at the top right (administrator rights required). Scroll down and locate Radmin VPN .
If the above don't work, the issue is likely outside your PC. on your router to let it automatically open ports. The Ultimate Fix
: In Windows network settings, unchecking "Automatic metric" and manually setting the Interface Metric to 1 for the Radmin VPN adapter can force the OS to prioritize the VPN network. Verdict
Note: For the best results, both you and the person you are trying to connect with should perform these steps. 1. Restart the Radmin VPN Service : Right-click the person you are trying to
Open the Start menu, type , and select it. Click the Change settings button at the top right. Look for Radmin VPN in the list.
Re-enable your antivirus. Go into its settings menu, locate the Exclusions , Exceptions , or Firewall Rules tab, and add the entire Radmin VPN installation directory to the whitelist. Step 3: Change Advanced Network Adapter Priority (Metric)
Radmin VPN can fail to establish direct TCP connections between peers when NAT, strict firewalls, or ISP filtering block peer-to-peer TCP traffic. In those situations Radmin VPN’s relay mode (routing traffic through intermediate servers or peers) or forcing TCP may be needed to restore connectivity. This piece explains causes, the typical “relay TCP” fix, and step-by-step troubleshooting and configuration.
Work through these solutions sequentially. Start with the easiest software tweaks before moving on to router configurations. 1. Configure Windows Defender Firewall Open a web browser, type your router’s gateway
If your router uses a "Strict" or "Symmetric" NAT configuration, a direct peer-to-peer connection is functionally impossible.
Log into your router’s admin dashboard by typing your gateway IP address (usually 192.168.1.1 or 192.168.0.1 ) into a web browser. Navigate to the , WAN , or Security tab. Look for NAT Type or NAT Filtering .
If a public IP is unavailable, consider using a different internet connection (like a mobile hotspot) to test if the direct connection is established. 3. Restart Network Equipment (Router)
Look at the bottom of the "IP Settings" tab for . Uncheck this box.