Manually open TCP port 4899 and the range 17000–18000 in your firewall settings. 2. Configure Router Settings
Click the button to shut down the Radmin VPN service. Wait for 10-15 seconds. Click the "Power" button again to restart it. Check the connection status of your network peers. 4. Reinstall Radmin VPN Adapter
Offer tips for troubleshooting (e.g., Minecraft, Stronghold). Help you check your NAT type (Open, Moderate, Strict).
:Both users should log into their router settings and enable the DMZ (Demilitarized Zone) function, pointing it to their local IP address. Reboot the router and restart Radmin VPN afterward. radmin vpn relay tcp fix work
The ideal scenario. Data travels directly from your computer to your peer's computer. It features the lowest possible ping.
Sometimes, it is not your router. It is your . If you are on mobile broadband (T-Mobile Home Internet, Starlink, 5G) or a cheap DSL line, you are likely behind CGNAT (Carrier-Grade NAT) . You do not have a public IP. No amount of port forwarding will work.
Radmin VPN is very transparent about its connection status. To check your link type: Manually open TCP port 4899 and the range
Execute the following commands one by one, pressing after each:
:Ensure the port range 17000–18000 is open in your Windows Firewall and router. You can follow a Windows Firewall port guide for step-by-step instructions.
How to Fix Radmin VPN "Relay TCP" Connection Issues Radmin VPN is a popular tool for creating virtual private networks, allowing gamers and remote workers to connect securely. However, seeing a status next to a friend's name instead of a direct connection can severely degrade your experience. A Relay TCP connection means your traffic is bouncing through Radmin's public servers, causing high latency, packet loss, and game lag. Wait for 10-15 seconds
Press Windows Key + R , type ncpa.cpl , and press to open Network Connections. Right-click the Radmin VPN adapter and select Properties . Double-click Internet Protocol Version 4 (TCP/IPv4) . Click the Advanced button at the bottom right. Uncheck the Automatic metric box.
If using third-party security software (like Kaspersky or ESET), set the " Famatech Radmin VPN Ethernet Adapter " to or Private Network .
What software do you currently have installed?
If you see "Relay/TCP," work through the following steps in order. For 90% of users, one of the first few solutions will resolve the issue.
: After changing these settings, both you and the other user should restart your routers and Radmin VPN. 2. Firewall and Antivirus Exceptions