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// Other services

Port 5726: Microsoft Lifecycle Manager Secure Token Service

Port 5726 is assigned by IANA to ms-ilm-sts (Microsoft Lifecycle Manager Secure Token Service).

5726

How ms-ilm-sts works

Other services
client:5726ms-ilm-stsresponse client:5726ms-ilm-stsresponse

The client sends a request to port 5726 and the ms-ilm-sts service answers.

Transport
TCP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 5726 dangerous?

We have no specific security note for port 5726. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 5726

ServicePortTransportDescriptionReferenceUpdated
ms-ilm-sts 5726 TCP Microsoft Lifecycle Manager Secure Token Service - -
-5726-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 5726, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5726'      # process listening on 5726
sudo lsof -nP -i :5726

macOS

sudo lsof -nP -i :5726

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5726 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5726
netstat -ano | findstr :5726

From another machine

nmap -p 5726 -sV <host>
nc -zv <host> 5726

Block it in the firewall

sudo ufw deny 5726/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5726" -Direction Inbound -LocalPort 5726 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5726 used for?

Port 5726 is assigned by IANA to ms-ilm-sts (Microsoft Lifecycle Manager Secure Token Service).

Is port 5726 TCP or UDP?

Port 5726 is registered for TCP.

Is it safe to open port 5726?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 5726 is open?

On Linux run "ss -ltnup 'sport = :5726'", on macOS "lsof -nP -i :5726", and on Windows "netstat -ano | findstr :5726" to see the local process. From another machine, "nmap -p 5726 <host>" shows whether it is reachable.

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