Permission errors

UDP port 17784 is above 1024, so binding it typically does NOT need root. On some platforms (rare), the port may be reserved or otherwise restricted, in which case you'll see an error like:

listen UDP: listen udp4 0.0.0.0:17784: bind: permission denied

If that happens:

• On macOS: usually a corporate-MDM or LittleSnitch-style rule. Check your firewall config.
• On Linux: rare but possible. Try sudo go-udap discover once to confirm; if that works, find what restricts unprivileged 17784.
• On Windows: check Windows Defender Firewall for go-udap.exe.

If sudo does NOT fix it, the next thing to check is whether some other process is already bound to 17784:

# Linux
sudo ss -ulnp | grep :17784

# macOS
sudo lsof -iUDP:17784

If mocksbr (the test mock) is running on the same host, that explains it — stop the mock.