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// Other services

Port 5359: Microsoft Alerter

Port 5359 is assigned by IANA to ms-alerter (Microsoft Alerter).

5359

How ms-alerter works

Other services
client:5359ms-alerterresponse client:5359ms-alerterresponse

The client sends a request to port 5359 and the ms-alerter service answers.

Transport
TCP · UDP
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 5359 dangerous?

We have no specific security note for port 5359. 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 5359

ServicePortTransportDescriptionReferenceUpdated
ms-alerter 5359 TCP, UDP Microsoft Alerter - 2007-08-07

// source: IANA service name and port number registry

03 Check it

Which program uses port 5359, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5359'      # process listening on 5359
sudo lsof -nP -i :5359

macOS

sudo lsof -nP -i :5359

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5359 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5359
netstat -ano | findstr :5359

From another machine

nmap -p 5359 -sV <host>
sudo nmap -sU -p 5359 <host>
nc -zv <host> 5359

Block it in the firewall

sudo ufw deny 5359/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5359" -Direction Inbound -LocalPort 5359 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5359 used for?

Port 5359 is assigned by IANA to ms-alerter (Microsoft Alerter).

Is port 5359 TCP or UDP?

Port 5359 is registered for TCP and UDP.

Is it safe to open port 5359?

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 5359 is open?

On Linux run "ss -ltnup 'sport = :5359'", on macOS "lsof -nP -i :5359", and on Windows "netstat -ano | findstr :5359" to see the local process. From another machine, "nmap -p 5359 <host>" shows whether it is reachable.

05 Related
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