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// Other services

Port 3157: LSA Communicator

Port 3157 is assigned by IANA to lsa-comm (LSA Communicator).

3157

How lsa-comm works

Other services
client:3157lsa-commresponse client:3157lsa-commresponse

The client sends a request to port 3157 and the lsa-comm 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 3157 dangerous?

We have no specific security note for port 3157. 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 3157

ServicePortTransportDescriptionReferenceUpdated
lsa-comm 3157 TCP, UDP LSA Communicator - 2024-03-18

// source: IANA service name and port number registry

03 Check it

Which program uses port 3157, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3157'      # process listening on 3157
sudo lsof -nP -i :3157

macOS

sudo lsof -nP -i :3157

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3157 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3157
netstat -ano | findstr :3157

From another machine

nmap -p 3157 -sV <host>
sudo nmap -sU -p 3157 <host>
nc -zv <host> 3157

Block it in the firewall

sudo ufw deny 3157/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3157" -Direction Inbound -LocalPort 3157 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3157 used for?

Port 3157 is assigned by IANA to lsa-comm (LSA Communicator).

Is port 3157 TCP or UDP?

Port 3157 is registered for TCP and UDP.

Is it safe to open port 3157?

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 3157 is open?

On Linux run "ss -ltnup 'sport = :3157'", on macOS "lsof -nP -i :3157", and on Windows "netstat -ano | findstr :3157" to see the local process. From another machine, "nmap -p 3157 <host>" shows whether it is reachable.

05 Related
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