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Port 3929 (smauth-port)

IANA assigns port 3929 to smauth-port: AMS Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
smauth-port TCP AMS Port Angelique Dokos -
smauth-port UDP AMS Port Angelique Dokos -

Registry dates for this port: registered 2003-11.

Check what is listening on port 3929

Linux: is anything listening on TCP 3929?
sudo ss -tlnp 'sport = :3929'
Linux: UDP 3929
sudo ss -ulnp 'sport = :3929'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3929
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3929 '
Windows (Command Prompt)
netstat -ano | findstr :3929
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3929 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3929
From Windows
Test-NetConnection HOST -Port 3929
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3929

Block port 3929 in the firewall

ufw
sudo ufw deny 3929/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3929 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3929 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3929' -Direction Inbound -Protocol TCP -LocalPort 3929 -Action Block
ufw
sudo ufw deny 3929/udp
iptables
sudo iptables -A INPUT -p udp --dport 3929 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3929 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3929' -Direction Inbound -Protocol UDP -LocalPort 3929 -Action Block

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All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.