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Port 709 (entrust-kmsh)

IANA assigns port 709 to entrust-kmsh: Entrust Key Management Service Handler.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
entrust-kmsh TCP Entrust Key Management Service Handler - -
entrust-kmsh UDP Entrust Key Management Service Handler - -

Check what is listening on port 709

Linux: is anything listening on TCP 709?
sudo ss -tlnp 'sport = :709'
Linux: UDP 709
sudo ss -ulnp 'sport = :709'
Linux / macOS: which process owns the port
sudo lsof -nP -i :709
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':709 '
Windows (Command Prompt)
netstat -ano | findstr :709
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 709 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 709
From Windows
Test-NetConnection HOST -Port 709
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 709

Block port 709 in the firewall

ufw
sudo ufw deny 709/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 709 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 709 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 709' -Direction Inbound -Protocol TCP -LocalPort 709 -Action Block
ufw
sudo ufw deny 709/udp
iptables
sudo iptables -A INPUT -p udp --dport 709 -j DROP
nftables
sudo nft add rule inet filter input udp dport 709 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 709' -Direction Inbound -Protocol UDP -LocalPort 709 -Action Block

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