Hamachi Direct Tunnel Blocked Fixed

In Hamachi: > Options > Settings > Advanced Settings .

| Cause | Explanation | |-------|-------------| | | Both peers are behind symmetric NAT or restricted cone NAT | | Double NAT | ISP-level NAT + router NAT (e.g., CGNAT, mobile hotspots, some Starlink) | | Firewall blocking | Windows Defender, third-party AV, or router firewall blocks Hamachi’s UDP ports | | VPN interference | Another VPN (corporate, Proton, WireGuard) changes routing table or blocks non-VPN traffic | | Hamachi virtual adapter disabled | Network adapter turned off or driver corrupted | | IPv6 mismatch | One peer has IPv6 enabled, the other doesn’t – can interfere with direct discovery | | ISP restrictions | Some ISPs block UDP hole punching (rare but possible) | hamachi direct tunnel blocked

I can provide specific steps if you know your router model! In Hamachi: > Options > Settings > Advanced Settings

Under , find Local UDP Address and set it to 12122 . Find Local TCP Address and set it to 12121 . Find Local TCP Address and set it to 12121