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Port 617 (sco-dtmgr)

IANA assigns port 617 to sco-dtmgr: SCO Desktop Administration Server.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
sco-dtmgr TCP SCO Desktop Administration Server Christopher Durham -
sco-dtmgr UDP SCO Desktop Administration Server Christopher Durham -

Check what is listening on port 617

Linux: is anything listening on TCP 617?
sudo ss -tlnp 'sport = :617'
Linux: UDP 617
sudo ss -ulnp 'sport = :617'
Linux / macOS: which process owns the port
sudo lsof -nP -i :617
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':617 '
Windows (Command Prompt)
netstat -ano | findstr :617
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 617 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 617
From Windows
Test-NetConnection HOST -Port 617
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 617

Block port 617 in the firewall

ufw
sudo ufw deny 617/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 617 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 617 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 617' -Direction Inbound -Protocol TCP -LocalPort 617 -Action Block
ufw
sudo ufw deny 617/udp
iptables
sudo iptables -A INPUT -p udp --dport 617 -j DROP
nftables
sudo nft add rule inet filter input udp dport 617 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 617' -Direction Inbound -Protocol UDP -LocalPort 617 -Action Block

Related ports

615sco-inetmgr616sco-sysmgr618dei-icda619compaq-evm

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