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// Other services

Port 2171: MS Firewall Storage

Port 2171 is assigned by IANA to msfw-storage (MS Firewall Storage).

2171

How msfw-storage works

Other services
client:2171msfw-storageresponse client:2171msfw-storageresponse

The client sends a request to port 2171 and the msfw-storage 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 2171 dangerous?

We have no specific security note for port 2171. 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 2171

ServicePortTransportDescriptionReferenceUpdated
msfw-storage 2171 TCP, UDP MS Firewall Storage - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2171, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2171'      # process listening on 2171
sudo lsof -nP -i :2171

macOS

sudo lsof -nP -i :2171

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2171 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2171
netstat -ano | findstr :2171

From another machine

nmap -p 2171 -sV <host>
sudo nmap -sU -p 2171 <host>
nc -zv <host> 2171

Block it in the firewall

sudo ufw deny 2171/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2171" -Direction Inbound -LocalPort 2171 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2171 used for?

Port 2171 is assigned by IANA to msfw-storage (MS Firewall Storage).

Is port 2171 TCP or UDP?

Port 2171 is registered for TCP and UDP.

Is it safe to open port 2171?

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 2171 is open?

On Linux run "ss -ltnup 'sport = :2171'", on macOS "lsof -nP -i :2171", and on Windows "netstat -ano | findstr :2171" to see the local process. From another machine, "nmap -p 2171 <host>" shows whether it is reachable.

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