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Port 590 (tns-cml)

IANA assigns port 590 to tns-cml: TNS CML.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
tns-cml TCP TNS CML Jerome Albin -
tns-cml UDP TNS CML Jerome Albin -

Check what is listening on port 590

Linux: is anything listening on TCP 590?
sudo ss -tlnp 'sport = :590'
Linux: UDP 590
sudo ss -ulnp 'sport = :590'
Linux / macOS: which process owns the port
sudo lsof -nP -i :590
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':590 '
Windows (Command Prompt)
netstat -ano | findstr :590
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 590 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 590
From Windows
Test-NetConnection HOST -Port 590
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 590

Block port 590 in the firewall

ufw
sudo ufw deny 590/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 590 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 590 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 590' -Direction Inbound -Protocol TCP -LocalPort 590 -Action Block
ufw
sudo ufw deny 590/udp
iptables
sudo iptables -A INPUT -p udp --dport 590 -j DROP
nftables
sudo nft add rule inet filter input udp dport 590 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 590' -Direction Inbound -Protocol UDP -LocalPort 590 -Action Block

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