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// Other services

Port 2173: MS Firewall Replication

Port 2173 is assigned by IANA to msfw-replica (MS Firewall Replication).

2173

How msfw-replica works

Other services
client:2173msfw-replicaresponse client:2173msfw-replicaresponse

The client sends a request to port 2173 and the msfw-replica 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 2173 dangerous?

We have no specific security note for port 2173. 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 2173

ServicePortTransportDescriptionReferenceUpdated
msfw-replica 2173 TCP, UDP MS Firewall Replication - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2173, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2173'      # process listening on 2173
sudo lsof -nP -i :2173

macOS

sudo lsof -nP -i :2173

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2173 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2173
netstat -ano | findstr :2173

From another machine

nmap -p 2173 -sV <host>
sudo nmap -sU -p 2173 <host>
nc -zv <host> 2173

Block it in the firewall

sudo ufw deny 2173/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2173" -Direction Inbound -LocalPort 2173 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2173 used for?

Port 2173 is assigned by IANA to msfw-replica (MS Firewall Replication).

Is port 2173 TCP or UDP?

Port 2173 is registered for TCP and UDP.

Is it safe to open port 2173?

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 2173 is open?

On Linux run "ss -ltnup 'sport = :2173'", on macOS "lsof -nP -i :2173", and on Windows "netstat -ano | findstr :2173" to see the local process. From another machine, "nmap -p 2173 <host>" shows whether it is reachable.

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