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Port 1384 (os-licman)

IANA assigns port 1384 to os-licman: Objective Solutions License Manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
os-licman TCP Objective Solutions License Manager Donald Cornwell -
os-licman UDP Objective Solutions License Manager Donald Cornwell -

Check what is listening on port 1384

Linux: is anything listening on TCP 1384?
sudo ss -tlnp 'sport = :1384'
Linux: UDP 1384
sudo ss -ulnp 'sport = :1384'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1384
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1384 '
Windows (Command Prompt)
netstat -ano | findstr :1384
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1384 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1384
From Windows
Test-NetConnection HOST -Port 1384
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1384

Block port 1384 in the firewall

ufw
sudo ufw deny 1384/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1384 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1384 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1384' -Direction Inbound -Protocol TCP -LocalPort 1384 -Action Block
ufw
sudo ufw deny 1384/udp
iptables
sudo iptables -A INPUT -p udp --dport 1384 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1384 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1384' -Direction Inbound -Protocol UDP -LocalPort 1384 -Action Block

Related ports

1382udt-os, udt_os1383gwha1385atex-elmd, atex_elmd1386checksum

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