A Relay/TCP connection in Radmin VPN occurs when a direct connection between two computers cannot be established, often resulting in high latency (400ms+) and slow data speeds. This is typically caused by strict NAT settings, firewalls, or ISP limitations. Primary Fixes for Relay/TCP Mode
Configure DMZ Settings: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.
Open Required Ports: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.
Adjust Interface Metric:Changing the priority of the Radmin VPN adapter can force a more stable connection.
Open Network Connections and find the Famatech Radmin VPN Ethernet Adapter.
Go to Properties > Internet Protocol Version 4 (TCP/IPv4) > Advanced.
Uncheck "Automatic metric" and set the "Interface metric" to 1.
Trust the Network in Security Software:Antivirus programs like Kaspersky, McAfee, or Norton may block the adapter. In your antivirus firewall settings, find the Radmin VPN adapter and set its status to "Trusted Network" or "Full Reliability". Advanced Troubleshooting Relay connection vs direct connection - Radmin Club
In Radmin VPN, a Relay/TCP connection occurs when a direct "point-to-point" link between two computers is blocked by firewalls, NAT settings, or ISP restrictions. While the connection still works, it often results in higher latency and slower speeds because traffic must pass through a relay server.
To fix this and establish a direct connection, follow these steps: 1. Adjust Firewall and Antivirus Exceptions Firewalls are the most common cause of relay connections.
Add Exceptions: Ensure Radmin VPN and your game are added to the "Allowed Apps" list in Windows Firewall. Trust the Network:
If using third-party security software (like Kaspersky or ESET), set the " Famatech Radmin VPN Ethernet Adapter " to Trusted or Private Network.
Specific Ports: Manually open TCP port 4899 and the range 17000–18000 in your firewall settings. 2. Configure Router Settings radmin vpn relay tcp fix work
If the firewall fix doesn't work, the issue likely lies with your router's NAT (Network Address Translation).
Port Forwarding: Log into your router and forward TCP/UDP ports 17301–17400 to your computer's local IP address.
Enable DMZ: As a temporary test, you can place your local PC in the router's DMZ (Demilitarized Zone). If both users do this, it often forces a direct connection.
UPnP: Ensure UPnP (Universal Plug and Play) is enabled in your router settings to help the VPN negotiate a path through the NAT. 3. Change Interface Metric
Windows sometimes prioritizes other network adapters over the Radmin VPN adapter, causing it to fail a direct handshake.
Open Control Panel > Network and Sharing Center > Change adapter settings.
Right-click Radmin VPN > Properties > IPv4 > Properties > Advanced.
Uncheck "Automatic metric" and set the Interface metric to 1. Restart Radmin VPN. 4. Troubleshoot ISP Restrictions
If many users on your network show as Relay/TCP, your internet provider may be using CGNAT (Carrier-Grade NAT), which prevents direct incoming connections.
Static/Public IP: Contacting your ISP to request a public IP address is often the only permanent fix for CGNAT-related relay issues.
DNS Change: Switching your DNS to Google (8.8.8.8) or Cloudflare (1.1.1.1) can sometimes resolve persistent "Connecting" or relay states.
"Connection failed ... did not properly respond in time" - Radmin Club A Relay/TCP connection in Radmin VPN occurs when
A Relay/TCP connection in Radmin VPN occurs when the software cannot establish a direct connection between two computers, forcing traffic through a third-party relay server. This often results in high latency (lag). 1. Adjust Firewall and Antivirus Settings
Security software often blocks the direct UDP traffic Radmin VPN needs, forcing it into Relay/TCP mode.
Create Exceptions: Ensure both Radmin VPN and the game/application are added to your firewall's allow list.
Check Adapter Profile: In your firewall settings (e.g., Avast, Norton, or Kaspersky), set the Famatech Radmin VPN Ethernet Adapter to a "Trusted" or "Private" network profile.
Disable Temporarily: Turn off your firewall or antivirus briefly to test if it fixes the relay status. If it does, you need better exclusion rules. 2. Optimize Network Adapter Priority
Windows might prioritize other network connections over Radmin VPN, causing it to default to a relay. Open the Network and Sharing Center via the Control Panel.
Right-click Radmin VPN > Properties > Internet Protocol Version 4 (TCP/IPv4) > Properties. Click Advanced and uncheck Automatic Metric.
Set the Interface Metric to 1 to give Radmin highest priority. 3. Router and Provider Solutions Radmin VPN - Help
In the depths of the internet, where connectivity and security were paramount, a peculiar issue had been plaguing users of Radmin VPN. The software, known for its robust remote access capabilities, had been experiencing a quirk that left many scratching their heads. It seemed that when attempting to use the VPN with TCP relay, the connection would falter, refusing to work as intended.
The tale begins with a determined individual, let's call him Alex, a network engineer with a penchant for solving the unsolvable. Alex had been tasked with finding a solution to this Radmin VPN relay TCP issue, and he was not one to back down from a challenge.
As he dove deeper into the problem, Alex discovered that the issue was not with Radmin VPN itself, but rather with the way it interacted with certain network configurations. It appeared that the TCP relay feature, designed to enhance connectivity, was not playing nicely with the underlying network protocols.
Undeterred, Alex set out to find a fix. He spent countless hours poring over lines of code, analyzing network packets, and consulting with fellow engineers. The journey was long and arduous, but Alex was driven by a sense of curiosity and a determination to crack the case. Update Radmin VPN on all machines
One fateful evening, as the sun dipped below the horizon, Alex stumbled upon an obscure forum post that would change everything. A fellow engineer, who went by the handle "Echo-1," had shared a cryptic message that read: "Try tweaking the TCP window scaling factor; it might just do the trick."
Intrigued, Alex decided to investigate further. He dove into the Radmin VPN settings, searching for the elusive TCP window scaling factor. After a few minutes of digging, he found the option and, with a hint of trepidation, adjusted the value.
To his surprise, the change worked like magic. The Radmin VPN relay TCP connection sprang to life, stable and robust. Alex couldn't believe his eyes; the solution had been hiding in plain sight all along.
Word of Alex's discovery spread quickly, and soon, the Radmin VPN community was abuzz with excitement. Users from all corners of the globe thanked Alex for his perseverance and ingenuity, as they too were able to fix the relay TCP issue.
As for Alex, he continued to explore the depths of the internet, seeking out new challenges and solving problems that others deemed insurmountable. His legend grew, and his name became synonymous with technical wizardry.
The story of Alex and the Radmin VPN relay TCP fix serves as a testament to the power of determination and collaboration. In the ever-evolving landscape of technology, it's a reminder that even the most perplexing issues can be resolved with persistence, creativity, and a willingness to share knowledge.
Direct (UDP).netstat -an | findstr "33001" → should show UDP established.If Radmin persists in Relay (TCP) with high ping (>100ms):
| Alternative | Relay Protocol | Performance | |-------------|----------------|--------------| | ZeroTier | UDP with relay fallback | Excellent | | Tailscale | WireGuard (UDP) + DERP relay (TCP) but optimized | Good | | Hamachi | TCP relay only | Worse than Radmin |
Export your Radmin network and migrate.
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.
If you are hosting a game server (Minecraft, Gmod, etc.):
%appdata%\Radmin VPN\Cache