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Port 627 (passgo-tivoli)

IANA assigns port 627 to passgo-tivoli: PassGo Tivoli.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
passgo-tivoli TCP PassGo Tivoli John Rainford 2 -
passgo-tivoli UDP PassGo Tivoli John Rainford 2 -

Check what is listening on port 627

Linux: is anything listening on TCP 627?
sudo ss -tlnp 'sport = :627'
Linux: UDP 627
sudo ss -ulnp 'sport = :627'
Linux / macOS: which process owns the port
sudo lsof -nP -i :627
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':627 '
Windows (Command Prompt)
netstat -ano | findstr :627
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 627 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 627
From Windows
Test-NetConnection HOST -Port 627
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 627

Block port 627 in the firewall

ufw
sudo ufw deny 627/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 627 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 627 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 627' -Direction Inbound -Protocol TCP -LocalPort 627 -Action Block
ufw
sudo ufw deny 627/udp
iptables
sudo iptables -A INPUT -p udp --dport 627 -j DROP
nftables
sudo nft add rule inet filter input udp dport 627 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 627' -Direction Inbound -Protocol UDP -LocalPort 627 -Action Block

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