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Port 620 (sco-websrvrmgr)

IANA assigns port 620 to sco-websrvrmgr: SCO WebServer Manager.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
sco-websrvrmgr TCP SCO WebServer Manager Christopher Durham -
sco-websrvrmgr UDP SCO WebServer Manager Christopher Durham -

Check what is listening on port 620

Linux: is anything listening on TCP 620?
sudo ss -tlnp 'sport = :620'
Linux: UDP 620
sudo ss -ulnp 'sport = :620'
Linux / macOS: which process owns the port
sudo lsof -nP -i :620
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':620 '
Windows (Command Prompt)
netstat -ano | findstr :620
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 620 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 620
From Windows
Test-NetConnection HOST -Port 620
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 620

Block port 620 in the firewall

ufw
sudo ufw deny 620/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 620 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 620 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 620' -Direction Inbound -Protocol TCP -LocalPort 620 -Action Block
ufw
sudo ufw deny 620/udp
iptables
sudo iptables -A INPUT -p udp --dport 620 -j DROP
nftables
sudo nft add rule inet filter input udp dport 620 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 620' -Direction Inbound -Protocol UDP -LocalPort 620 -Action Block

Related ports

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