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// Other services

Port 5361: Secure Protocol for Windows SideShow

Port 5361 is assigned by IANA to ms-s-sideshow (Secure Protocol for Windows SideShow).

5361

How ms-s-sideshow works

Other services
client:5361ms-s-sideshowresponse client:5361ms-s-sideshowresponse

The client sends a request to port 5361 and the ms-s-sideshow 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 5361 dangerous?

We have no specific security note for port 5361. 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 5361

ServicePortTransportDescriptionReferenceUpdated
ms-s-sideshow 5361 TCP, UDP Secure Protocol for Windows SideShow - 2008-03-12

// source: IANA service name and port number registry

03 Check it

Which program uses port 5361, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5361'      # process listening on 5361
sudo lsof -nP -i :5361

macOS

sudo lsof -nP -i :5361

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5361 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5361
netstat -ano | findstr :5361

From another machine

nmap -p 5361 -sV <host>
sudo nmap -sU -p 5361 <host>
nc -zv <host> 5361

Block it in the firewall

sudo ufw deny 5361/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5361" -Direction Inbound -LocalPort 5361 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5361 used for?

Port 5361 is assigned by IANA to ms-s-sideshow (Secure Protocol for Windows SideShow).

Is port 5361 TCP or UDP?

Port 5361 is registered for TCP and UDP.

Is it safe to open port 5361?

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 5361 is open?

On Linux run "ss -ltnup 'sport = :5361'", on macOS "lsof -nP -i :5361", and on Windows "netstat -ano | findstr :5361" to see the local process. From another machine, "nmap -p 5361 <host>" shows whether it is reachable.

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