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Port 1399 (cadkey-licman)

IANA assigns port 1399 to cadkey-licman: Cadkey License Manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cadkey-licman TCP Cadkey License Manager - -
cadkey-licman UDP Cadkey License Manager - -

Check what is listening on port 1399

Linux: is anything listening on TCP 1399?
sudo ss -tlnp 'sport = :1399'
Linux: UDP 1399
sudo ss -ulnp 'sport = :1399'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1399
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1399 '
Windows (Command Prompt)
netstat -ano | findstr :1399
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1399 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1399
From Windows
Test-NetConnection HOST -Port 1399
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1399

Block port 1399 in the firewall

ufw
sudo ufw deny 1399/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1399 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1399 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1399' -Direction Inbound -Protocol TCP -LocalPort 1399 -Action Block
ufw
sudo ufw deny 1399/udp
iptables
sudo iptables -A INPUT -p udp --dport 1399 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1399 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1399' -Direction Inbound -Protocol UDP -LocalPort 1399 -Action Block

Related ports

1397audio-activmail1398video-activmail1400cadkey-tablet1401goldleaf-licman

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