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// Other services

Port 3248: PROCOS LM

Port 3248 is assigned by IANA to procos-lm (PROCOS LM).

3248

How procos-lm works

Other services
client:3248procos-lmresponse client:3248procos-lmresponse

The client sends a request to port 3248 and the procos-lm 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 3248 dangerous?

We have no specific security note for port 3248. 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 3248

ServicePortTransportDescriptionReferenceUpdated
procos-lm 3248 TCP, UDP PROCOS LM - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3248, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3248'      # process listening on 3248
sudo lsof -nP -i :3248

macOS

sudo lsof -nP -i :3248

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3248 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3248
netstat -ano | findstr :3248

From another machine

nmap -p 3248 -sV <host>
sudo nmap -sU -p 3248 <host>
nc -zv <host> 3248

Block it in the firewall

sudo ufw deny 3248/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3248" -Direction Inbound -LocalPort 3248 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3248 used for?

Port 3248 is assigned by IANA to procos-lm (PROCOS LM).

Is port 3248 TCP or UDP?

Port 3248 is registered for TCP and UDP.

Is it safe to open port 3248?

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 3248 is open?

On Linux run "ss -ltnup 'sport = :3248'", on macOS "lsof -nP -i :3248", and on Windows "netstat -ano | findstr :3248" to see the local process. From another machine, "nmap -p 3248 <host>" shows whether it is reachable.

05 Related
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