Check if port 51820 is open
On the server, see what is listening:
sudo ss -tulpn | grep ':51820 'From another machine, test reachability:
nc -zv your-server.example.com 51820Port 51820 (UDP) — WireGuard
WireGuard VPN default port.
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- Port
51820- Protocol
- UDP
- Service
- WireGuard
- Internet exposure risk
- Low
Safe to expose; WireGuard does not respond to unauthenticated packets.