For persistent TCP relay issues, Radmin’s protocol may be incompatible with your network. Use these instead (both support P2P):
| Tool | Fixes relay problem by |
|------|------------------------|
| ZeroTier | Direct Ethernet-layer VPN, no relay fallback |
| Tailscale (with --advertise-exit-node) | UDP hole punching + DERP relay disabled |
Sometimes, it is not your router. It is your ISP. 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.
The only fix for CGNAT: Create a software bridge. radmin vpn relay tcp fix work
If one user can forward ports:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RadminVpn\ParametersStaticPeerIP (string) with the public IP of forwarded user.Radmin VPN often fails because the installer doesn't create the right firewall rules automatically.
You cannot beat CGNAT, so you cheat.
Why this works: ZeroTier uses UDP hole-punching that handles CGNAT better than Radmin. It effectively "fixes" the TCP relay by bypassing Radmin’s infrastructure.
Q: Is "Relay (TCP)" dangerous? A: No. It is just slow. You are not hacked. But it ruins real-time games (shooters, fighters, RTS).
Q: Does Radmin VPN Relay fix work for Minecraft? A: Yes, but only if the host (server owner) fixes their UDP relay. Players connecting to a server do not need to fix their side; the server host does. For persistent TCP relay issues, Radmin’s protocol may
Q: My relay fix works for 10 minutes, then reverts to TCP. A: Your router’s NAT table is full. Reboot your router weekly. Also, disable "Energy Efficient Ethernet" in your network card properties.
Q: Can I just tell Radmin to disable TCP entirely? A: No. The software requires TCP as a fallback. That is the "Relay." You cannot disable it; you can only make it unnecessary by fixing UDP.
IPv6 often triggers relay fallback.