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// Other services

Port 2125: LOCKSTEP

Port 2125 is assigned by IANA to lockstep (LOCKSTEP).

2125

How lockstep works

Other services
client:2125lockstepresponse client:2125lockstepresponse

The client sends a request to port 2125 and the lockstep 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 2125 dangerous?

We have no specific security note for port 2125. 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 2125

ServicePortTransportDescriptionReferenceUpdated
lockstep 2125 TCP, UDP LOCKSTEP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2125, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2125'      # process listening on 2125
sudo lsof -nP -i :2125

macOS

sudo lsof -nP -i :2125

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2125 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2125
netstat -ano | findstr :2125

From another machine

nmap -p 2125 -sV <host>
sudo nmap -sU -p 2125 <host>
nc -zv <host> 2125

Block it in the firewall

sudo ufw deny 2125/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2125" -Direction Inbound -LocalPort 2125 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2125 used for?

Port 2125 is assigned by IANA to lockstep (LOCKSTEP).

Is port 2125 TCP or UDP?

Port 2125 is registered for TCP and UDP.

Is it safe to open port 2125?

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 2125 is open?

On Linux run "ss -ltnup 'sport = :2125'", on macOS "lsof -nP -i :2125", and on Windows "netstat -ano | findstr :2125" to see the local process. From another machine, "nmap -p 2125 <host>" shows whether it is reachable.

05 Related
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