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Port 5726 (ms-ilm-sts)

IANA assigns port 5726 to ms-ilm-sts: Microsoft Lifecycle Manager Secure Token Service.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ms-ilm-sts TCP Microsoft Lifecycle Manager Secure Token Service Rob Ward -

Check what is listening on port 5726

Linux: is anything listening on TCP 5726?
sudo ss -tlnp 'sport = :5726'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5726
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5726 '
Windows (Command Prompt)
netstat -ano | findstr :5726
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5726 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5726
From Windows
Test-NetConnection HOST -Port 5726

Block port 5726 in the firewall

ufw
sudo ufw deny 5726/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5726 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5726 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5726' -Direction Inbound -Protocol TCP -LocalPort 5726 -Action Block

Related ports

5724omsdk5725ms-ilm5727asgenf5728io-dist-data, io-dist-group

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