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Port 598 (sco-websrvrmg3)

IANA assigns port 598 to sco-websrvrmg3: SCO Web Server Manager 3.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
sco-websrvrmg3 TCP SCO Web Server Manager 3 Simon Baldwin -
sco-websrvrmg3 UDP SCO Web Server Manager 3 Simon Baldwin -

Check what is listening on port 598

Linux: is anything listening on TCP 598?
sudo ss -tlnp 'sport = :598'
Linux: UDP 598
sudo ss -ulnp 'sport = :598'
Linux / macOS: which process owns the port
sudo lsof -nP -i :598
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':598 '
Windows (Command Prompt)
netstat -ano | findstr :598
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 598 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 598
From Windows
Test-NetConnection HOST -Port 598
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 598

Block port 598 in the firewall

ufw
sudo ufw deny 598/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 598 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 598 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 598' -Direction Inbound -Protocol TCP -LocalPort 598 -Action Block
ufw
sudo ufw deny 598/udp
iptables
sudo iptables -A INPUT -p udp --dport 598 -j DROP
nftables
sudo nft add rule inet filter input udp dport 598 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 598' -Direction Inbound -Protocol UDP -LocalPort 598 -Action Block

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