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Port 1239 (nmsd)

IANA assigns port 1239 to nmsd: NMSD.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nmsd TCP NMSD Yuri Machkasov -
nmsd UDP NMSD Yuri Machkasov -

Check what is listening on port 1239

Linux: is anything listening on TCP 1239?
sudo ss -tlnp 'sport = :1239'
Linux: UDP 1239
sudo ss -ulnp 'sport = :1239'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1239
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1239 '
Windows (Command Prompt)
netstat -ano | findstr :1239
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1239 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1239
From Windows
Test-NetConnection HOST -Port 1239
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1239

Block port 1239 in the firewall

ufw
sudo ufw deny 1239/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1239 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1239 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1239' -Direction Inbound -Protocol TCP -LocalPort 1239 -Action Block
ufw
sudo ufw deny 1239/udp
iptables
sudo iptables -A INPUT -p udp --dport 1239 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1239 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1239' -Direction Inbound -Protocol UDP -LocalPort 1239 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.